Senior Network Engineer Systems Plus, Inc.Senior Network EngineerWashington, DCFull timeHolding many Defense & Federal government contracts around the globe, with Systems Plus, you have the opportunity to take on new and evolving challenges, aim beyond what you think you are capable of, and work in collaborative, dynamic, and high-tempo environments. We are committed to your success and well-being and offer competitive benefits packages, salaries, bonus/award programs, and a high potential for professional growth and job opportunities worldwide.
NewActive Directory Architect- Active Secret Clearance Required VETS, IncActive Directory Architect- Active Secret Clearance RequiredWashington, DCHowever, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with the contractor’s legal duty to furnish information. Expert knowledge designing, testing, deploying and maintaining Active Directory Group Policy (GPO) for the purpose of securing Domain Controllers, Domain Member Servers and Domain Member Workstations.
Cloud Architect / Engineer LeidosCloud Architect / EngineerWashington, DC$131,300–$237,350Proven expertise with Generative AI infrastructure, including: Production-ready Retrieval-Augmented Generation (RAG) pipelines, Scalable vector databases (e.g., Pinecone, Weaviate, Milvus, FAISS, or managed services) with indexing, clustering, and optimized retrieval, GPU/TPU compute clusters, managed container orchestration (Kubernetes/EKS/AKS/GKE), and auto-scaling for large language model (LLM) workloads. Demonstrated experience implementing enterprise security and compliance frameworks (SOC 2, ISO 27001, HIPAA, PCI-DSS, CMMC, FedRAMP, etc.), including encryption, threat monitoring, and zero-trust architectures.
Active Directory Architect / Engineer LeidosActive Directory Architect / EngineerSilver Spring, MD$131,300–$237,350Design, deploy, upgrade, and administer Active Directory Domain Services, including domain controllers, forests, domains, trusts, and replication topologies (i.e. Manage and optimize Group Policy Objects (GPOs), OU structures, and security baselines; including object management through bulk operations and automation, Troubleshoot and resolve complex AD-related issues, including authentication failures, replication problems, DNS issues, and Kerberos/NTLM problems, Plan and execute Active Directory migrations, consolidations, and upgrades (of both underlying server infrastructure and overall forest/domain functional levels), Develop and maintain disaster recovery, backup, and restore procedures for AD environments (including AD Recycle Bin and authoritative restores), Monitor AD health and performance using tools such as Microsoft System Center, Azure Monitor, or third-party solutions). Deep expertise in designing, deploying, upgrading, and administering Microsoft Active Directory Domain Services (AD DS), including domain controllers, multi-domain/forest architectures, trusts, replication topologies, Group Policy Objects (GPOs), OU design, and security baselines.
Enterprise Architect/Systems Engineer LeidosEnterprise Architect/Systems EngineerBethesda, MD$131,300–$237,350Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.
Mission Critical Architect Whitman, Requardt & Associates, LLPMission Critical ArchitectBaltimore, MD$100,000–$180,000 / yearFull timeThe ideal candidate brings deep technical expertise in data center and mission critical facility design, strong team leadership capabilities, and a track record of delivering highly reliable, resilient facilities for demanding institutional and private-sector clients. This senior-level role will drive project design from concept through construction, providing technical leadership, mentoring junior staff, and serving as a trusted advisor to clients on the complex programming, planning, and design requirements unique to mission critical environments.
Sr Cloud Security Engineer PlanIT GroupSr Cloud Security EngineerFalls Church, VAExperience: 8+ years in a technical Cybersecurity Engineering role, with at least 4 years focused on large-scale cloud or hybrid environments, and a portfolio of projects where AI or Machine Learning was directly applied to solve security or operational scaling problems. • API-First Automation: Deep expertise in building "glue code" that connects disparate COTS and custom applications via secure, automated APIs to streamline cross-functional business activities.
NewSenior Platform Engineer System OneSenior Platform EngineerWashington, DCWe're seeking a talented Platform Engineer to help architect, deploy, and manage our AWS and on-premises platforms while supporting emerging AI capabilities, modern containerized workloads, and enterprise virtualization environments. • Manage Kubernetes fleet operations across AWS EKS, on-premises Mirantis Kubernetes Engine (MKE), and VMware vSphere with Kubernetes (VKS).
Director, Field Sales Engineering SamsaraDirector, Field Sales EngineeringWashington DC, DCRemoteYour team will play a critical role in translating early-stage product capabilities into clear, differentiated customer outcomes, influencing product direction through structured field feedback, and building repeatable technical sales plays that enable broader field adoption. In this role, you will partner closely with Sales, Product, Engineering, and Product Marketing to accelerate adoption of Samsara’s newest innovations and ensure we deliver exceptional technical value to customers — from early-stage introduction through scaled deployment.
Lead Systems Engineer LeidosLead Systems EngineerWashington, DC$107,900–$195,050If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com. June 22, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
Senior Network Architect Expert In Recruitment SolutionsSenior Network ArchitectWashington, DCOwn and evolve enterprise routing architecture with deep expertise in BGP and OSPF, including policy design, traffic engineering, convergence behavior, and failure handling at scale Design, implement, and operate modern data center fabrics (spine-leaf, VXLAN/EVPN) including integration with cloud and virtual infrastructure platforms with a focus on stability, scalability, and operational simplicity. The ideal candidate is not only a subject matter expert in BGP, OSPF and VXLANs, but also a well-rounded network engineer who can support day-to-day operations, contribute to security and visibility platforms, and drive innovative improvements across the network.
NS-Cloud Network Architect, Senior (Tactical / Hybrid Cloud / Zero Trust) NETSEA TechnologiesNS-Cloud Network Architect, Senior (Tactical / Hybrid Cloud / Zero Trust)APG, MDThe Cloud Network Architect (Senior) provides advanced technical leadership for the design, integration, and sustainment of hybrid cloud and tactical network architectures supporting DoW tactical communications environments. This role focuses on the convergence of enterprise cloud, edge computing, and deployed tactical networks, ensuring secure, resilient, and interoperable communications across RF, SATCOM, and IP-based transport systems.
Network Architect ManTech International CorpNetwork ArchitectLaurel, MD$128,000–$214,400 / yearAs a Senior Network Engineer/Architect, you will work alongside customers, Integrated Product Teams (IPTs), and vendors to support the implementation and compliance of advanced EIT capabilities through Data Center & Compute Services. Preferred Qualifications: Provides advice & guidance to IT peers & subordinates regarding complex network design, monitoring, maintenance and implementation, consistent with the general principles followed within campus networks & generally accepted industry best practices.
Network Architect / WAN Engineer CyberPoint International LLCNetwork Architect / WAN EngineerMDThis role requires deep expertise in IP routing and enterprise-scale WAN environments, strong experience with Red/Black network architectures and the ability to provide highly technical guidance to both customers and internal teams. What We're Looking For As a Network Architect / WAN Engineer at CyberPoint, you will lead the design, architecture and integration of Wide Area Network (WAN) solutions supporting mission-critical programs across the Intelligence Community (IC).
Sr. Network Architect SME System OneSr. Network Architect SMEWashington, District of ColumbiaThe ideal candidate is not only a subject matter expert in BGP, OSPF and VXLANs, but also a well-rounded network engineer who can support day-to-day operations, contribute to security and visibility platforms, and drive innovative improvements across the network. Design, implement, and operate modern data center fabrics (spine-leaf, VXLAN/EVPN) including integration with cloud and virtual infrastructure platforms with a focus on stability, scalability, and operational simplicity .
Lead, Network Architect - DC Core Humana IncLead, Network Architect - DC CoreWashington, DCRemote$129,300–$177,800 / yearWork at Home Requirements To ensure Home or Hybrid Home/Office employees' ability to work effectively, the self-provided internet service of Home or Hybrid Home/Office employees must meet the following criteria: At minimum, a download speed of 25 Mbps and an upload speed of 10 Mbps is required; wireless, wired cable or DSL connection is suggested. Through our Humana insurance services and our CenterWell healthcare services, we make it easier for the millions of people we serve to achieve their best health - delivering the care and service they need, when they need it.
Computer Network Architect Contract Professionals, Inc.Computer Network ArchitectAberdeen, MD$65,000–$110,000 / yearThis role is responsible for developing reliable network infrastructure, evaluating emerging technologies, supporting technical refresh initiatives, and ensuring compliance with cybersecurity and DoD requirements. Our client is seeking a Computer Network Architect to design, implement, and maintain secure network architectures supporting Department of Defense programs.
Network Architect Essnova SolutionsNetwork ArchitectWashington, District of ColumbiaMust have at least 9 years’ experience working with network infrastructure and cloud network technologies (i.e., Routing, Switching, Virtual Private Cloud (VPC), Virtual Network, NAT Gateways, VPN Gateways, Route53, DNS, Traffic Manager, Network Load Balancer, Application Gateway, Custom Route Tables, User Defined Routes, AWS Direct Connect and Azure ExpressRoute). Provide expertise with Azure and AWS cloud network technologies and equivalents such as Virtual Private Cloud (VPC), Virtual Network, NAT Gateways, VPN Gateways, Route53, DNS, Traffic Manager, Network Load Balancer, Application Gateway, Custom Route Tables, User Defined Routes, AWS Direct Connect and Azure ExpressRoute.
Computer Network Architect 4 CACIComputer Network Architect 4Aberdeen Proving Ground, MarylandCACI is currently seeking a Computer Network Architect to design and implement computer and information networks, such as local area networks (LAN), wide area networks (WAN), intranets, extranets, and other data communications networks. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Senior Network Architect Peraton IncSenior Network ArchitectArlington, VA$176,000–$282,000 / yearWe support a secure, worldwide, high-performance communications network comprised of real-time interactive applications allowing complex national and worldwide communications. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies.
Network Architect Peraton IncNetwork ArchitectLaurel, MD$146,000–$234,000 / yearOur dynamic team provides full spectrum network connectivity including architecture, engineering, development, integration, deployment, configuration management, project management and network security services to the global enterprise, as well as systems and cloud engineering services for application modernization and transition of legacy applications into hybrid cloud platforms. Benefits: Peraton offers enhanced benefits to employees working on this critical National Security program, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap and participation in an attractive bonus plan.
NewSenior Network Architect with TS/SCI Macpower Digital Assets Edge Private LimitedSenior Network Architect with TS/SCIAnnapolis Junction, MD$120,000–$167,000 / yearCisco Certified Design Expert (CCDE) AND VMware VCP-NV certifications, OR combination of CCIE (Enterprise/Service Provider/Data Center) with relevant virtualization/cloud certifications. 5+ years of experience designing, optimizing, and troubleshooting LAN, WAN, and low-bandwidth networks protected by network encryptors.
Network Architect CACI International IncNetwork ArchitectWashington, DC$105,100–$231,100 / yearServing as a technical expert on established and ad-hoc project teams providing technical direction, interpretation, and alternatives on existing and new services to meet both architectural and operational needs. Pay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Network Architect PeratonNetwork ArchitectLaurel, Maryland$146,000–$234,000 / yearFull timeOur dynamic team provides full spectrum network connectivity including architecture, engineering, development, integration, deployment, configuration management, project management and network security services to the global enterprise, as well as systems and cloud engineering services for application modernization and transition of legacy applications into hybrid cloud platforms. Peraton offers enhanced benefits to employees working on this critical National Security program, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap and participation in an attractive bonus plan.
Senior Network Architect PeratonSenior Network ArchitectArlington, Virginia$176,000–$282,000 / yearFull timeWe support a secure, worldwide, high-performance communications network comprised of real-time interactive applications allowing complex national and worldwide communications. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies.
Network Architect CymertekNetwork ArchitectAnnapolis JunctionNetwork Engineer, Systems Architect, Network Designer, Solutions Architect, Infrastructure Architect, Network Administrator, Cloud Architect, IT Architect, Telecommunications Architect, Network Consultant, ect. Computer Science, Information Technology, Network Engineering, Telecommunications, Electrical Engineering, Systems Engineering, Computer Engineering, Cybersecurity, Information Systems, Software Engineering, ect.
Network Architect - ITSC 2 Braxton-Grant TechnologiesNetwork Architect - ITSC 2MarylandAbility to develop network architectures and work with customers to develop test plans and conduct testing of architecture as required. Description: Braxton -Grant Technologies is looking for a Network Architect to aid in all aspects network design and implementation, maintenance, and upgrading of existing systems.
Cloud Network Architect - Associate Ang SignalCloud Network Architect - AssociateWashington, District of ColumbiaJob description – Cloud Network Architect We are seeking a highly skilled and certified Cloud Network Architect with deep expertise in Amazon Web Services (AWS) and hands-on experience across multicloud environments (Azure, GCP, Oracle). The ideal candidate will have a strong background in designing, deploying, and managing secure, scalable cloud solutions, particularly within the U.S. Federal sector, including FISMA Moderate and High systems.
NewSenior Network Architect (CISCO) Expert Technology ServicesSenior Network Architect (CISCO)Fulton, MDCisco Routing & Switching, Wireless, Firewalls, DNA Center, SDA, ACI, ISE, F5 Load Balancers, Infoblox (DNS/DHCP), high-availability design, network security, and enterprise transformation projects. - Responsible for architecting, designing, and implementing enterprise network solutions, with a key focus on Cisco Software Defined Access (SDA), DNA Center, ISE, and ACI.
Computer Network Architect ManTechComputer Network ArchitectBelcamp, MDNetMod sets forth the work efforts required to provide product technical support services for systems and equipment being produced, fielded, modified or supported by PdM Network Modernization (NetMod) and PdM Mission Network of the Project Manager (PM) Tactical Network (TN) of the Program Executive Office for Command Control and Communications-Tactical (PEO C3T). + Create detailed network blueprints, including LANs (Local Area Networks), WANs (Wide Area Networks), and intranets, considering factors like bandwidth requirements, security protocols, and scalability.
Cyberspace/Network Architect SME Peraton IncCyberspace/Network Architect SMEAnnapolis Junction, MD$176,000–$282,000 / yearPeraton seeks a Cyberspace/Network Architect SME to support the PACOM J6 with Command, Control, Communications, Computers and Cyber (C4/Cyber) technical authority during travel team deployments. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies.
Computer Network Architect (55271) DataPath IncComputer Network Architect (55271)MDDataPath, Inc. is seeking a Computer Network Architect to provide Design and implement computer and information networks, such as local area networks (LAN), wide area networks (WAN), intranets, extranets, and other data communications networks. DataPath is a global leader in remote satellite-based communications solutions that solve our customers' toughest communications challenges in urgent time frames and under extreme conditions.
Cyberspace/Network Architect SME PeratonCyberspace/Network Architect SMEAnnapolis Junction, Maryland$176,000–$282,000 / yearFull timeResponsibilities: Peraton seeks a Cyberspace/Network Architect SME to support the PACOM J6 with Command, Control, Communications, Computers and Cyber (C4/Cyber) technical authority during travel team deployments. As the world’s leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies.
Network Engineer-Architect Antero Technology ServicesNetwork Engineer-ArchitectAnnapolis JunctionWorking knowledge of network technologies and protocols including Trunking, VTP, Layer 2 & 3 Port-channels, Spanning-Tree, Port-Security, HSRP, EIGRP, OSPF, QoS, BGP, and MPLS, BFD. Antero Technology Services is looking for a proactive person with a TS/SCI clearance to join our Enterprise Infrastructure Engineering Team.
Senior Network Architect NUCLEUS TECH SOLUTIONS LLCSenior Network ArchitectLargo, MDThe Senior Network Architect leads in the design, development, and building of the networks using the latest in application centric infrastructure technologies, identifying the hardware and cabling needs, installing and configuring the network devices, and troubleshooting network problems. Candidate is proficient in network architecture, understands the network protocols and security requirements, and can design and implement a reliable and efficient network infrastructure.
New1649 - Computer Network Architect Sigma Defense1649 - Computer Network ArchitectBelcamp, MD$92,000–$133,000NetMod sets forth the work efforts required to provide product technical support services for systems and equipment being produced, fielded, modified or supported by PdM Network Modernization (NetMod) and PdM Mission Network of the Project Manager (PM) Tactical Network (TN) of the Program Executive Office for Command Control and Communications-Tactical (PEO C3T). Create detailed network blueprints, including LANs (Local Area Networks), WANs (Wide Area Networks), and intranets, considering factors like bandwidth requirements, security protocols, and scalability.
Computer Network Architect III CACI International IncComputer Network Architect IIIAberdeen Proving Ground, MDOpportunity: CACI is currently seeking a Computer Network Architect to design and implement computer and information networks, such as local area networks (LAN), wide area networks (WAN), intranets, extranets, and other data communications networks. The pay and benefits provided for this position will meet or exceed the minimum required amounts detailed in the wage determination issued by the Department of Labor and made applicable to this position, as incorporated into CACI's government contract for the work location.
Computer Network Architect 4 CACI International IncComputer Network Architect 4Aberdeen Proving Ground, MD$53,100–$106,300 / yearThe Opportunity: CACI is currently seeking a Computer Network Architect to design and implement computer and information networks, such as local area networks (LAN), wide area networks (WAN), intranets, extranets, and other data communications networks. Pay Range: There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Data Center Network Architect ITSC2 Braxton-Grant TechnologiesData Center Network Architect ITSC2MarylandBraxton -Grant Technologies is looking for a Data Center Architect to aid in all aspects of data center design and implementation from network design through implementation, maintenance, and upgrading of existing systems. Education: Bachelor’s degree in Computer Science, Information Systems, Engineering Science, or related discipline from an accredited college or university is required.
NewNetwork Architect Booz Allen Hamilton IncNetwork ArchitectMD$77,600–$176,000 / yearYou'll apply your expertise in routing and switching, network design and architecture, system interoperability, IP engineering, network transport layers, multi-protocol label switching, gateway protocol, and virtual routing and forwarding as you guide our team of problem-solvers to help the DoD evolve and deploy new capabilities and technologies. As a Network Engineer on our team, you'll use your experience in network design and architecture, system interoperability, OSI model, network transport layers, multi-protocol label switching, gateway protocol, and virtual routing and forwarding to support the nation's defense and respond to evolving adversaries.
Network Architect II ANG SIGNAL LLCNetwork Architect IISilver Spring, MDWork with a team of network experts to support a service provider scale network that connects multiple high performance computing sites and data centers, and provides network services to over 22,000 users nationwide . 10+ years of functional experience in a Network Engineering role, with at least 5 years of experience as a Technical Lead or SME in a large-scale enterprise network environment .
Senior Network Architect (CISCO) Kforce Inc.Senior Network Architect (CISCO)Fulton, MD$80–$100The ideal candidate will bring deep Cisco expertise and a proven track record designing and supporting enterprise-class network infrastructures. This is an excellent opportunity for a senior-level network professional looking to influence enterprise architecture strategy while remaining involved with cutting-edge infrastructure initiatives and technical leadership.
Network Architect/ Wan Engineer FLASH Technology GroupNetwork Architect/ Wan EngineerLaurel, Maryland$200,000–$222,000 / yearA variety of factors can impact the final salary offered, including, but not limited to, geographic location, Federal Government contract labor categories and wage rates, relevant work experience, specialized skills and competencies, education, and certifications. -Ability to develop network architectures and work with customers to develop test plans and conduct testing of architecture as required.
Wireless Network Architect CapeWireless Network ArchitectArlington, VirginiaCape is seeking a Wireless Network Architect who combines deep expertise in planning, building, and operating cellular networks with the vision and courage to disrupt legacy approaches and reimagine the future of telecom. Our journey began when our founder recognized a critical vulnerability in our modern world: everyone relies on the same stagnant cellular infrastructure and legacy systems that track our every movement, monitor and profile our connections, and lose and sell our personal data.
Network Architect CACINetwork ArchitectWashington Dc, District of ColumbiaServing as a technical expert on established and ad-hoc project teams providing technical direction, interpretation, and alternatives on existing and new services to meet both architectural and operational needs. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Network Architect-DHA Social Security AdministrationNetwork Architect-DHAMD$164,956–$197,200 / yearTravel Required Not required Relocation expenses reimbursed No Appointment type Permanent Work schedule Full-time Service Competitive Promotion potential None Job family Series 2210 Information Technology Management Supervisory status No Security clearance Top Secret Drug test No Position sensitivity and risk Critical-Sensitive CS High Risk Trust determination process National security Financial disclosure Yes Bargaining unit status No Announcement number SSA12902633-DHA-26-CIO Control number 860040900. Requirements Help Conditions of employment U.S. Citizenship required Selective Service Registration if applicable www.sss.gov Fingerprinting and background and/or security investigation may be required Job offers are contingent on fingerprinting and background security investigation results Selectees may be required to serve a 1-year probationary period Relocation expenses will not be paid All qualification requirements must be met by the closing date of the announcement Candidates will not be hired based on their race, sex, color, religion, or national origin.
NS-Systems Architect (Tactical Network / SATCOM / RF Integration) NETSEA TechnologiesNS-Systems Architect (Tactical Network / SATCOM / RF Integration)APG, MDThis role focuses on future-state design, integration strategy, and modernization of Army and joint network capabilities, bridging operational requirements with emerging technologies. The Systems Architect provides technical leadership in the design and evolution of large-scale tactical communications architectures.
Cloud Network Architect - Associate ANG SIGNAL LLCCloud Network Architect - AssociateWashington, DCWe are seeking a highly skilled and certified Cloud Network Architect with deep expertise in Amazon Web Services (AWS) and hands-on experience across multicloud environments (Azure, GCP, Oracle). The ideal candidate will have a strong background in designing, deploying, and managing secure, scalable cloud solutions, particularly within the U.S. Federal sector, including FISMA Moderate and High systems.
Telecom / Emergency Services Network Architect AHU TechnologiesTelecom / Emergency Services Network ArchitectWashington, District of ColumbiaSupporting the replacement, lifecycle management, and upgrade of networking equipment, including core, distribution, and access layer switches; routers; firewalls; and related hardware used across the agency’s network environment. The specialist develops and maintains detailed network documentation, including logical and physical diagrams, system interfaces, rack elevations, cabling records, and equipment inventories for 911 and 311 operations.
Network Solutions Architect Lumen Solutions Group, Inc.Network Solutions ArchitectWashington, DCRemoteYou will play a key role in developing future-state network architectures, driving technology modernization, and ensuring best practices are followed throughout the project lifecycle—from planning and design through implementation. Collaborate with business stakeholders, project teams, and infrastructure teams to deliver scalable network architectures.