CS 725/825 Computer Networks, IT 725 Network Technology
- Categories of networks. Basic concepts and terminology.
- Layered model, OSI 7-layer model. Internet layers, common functions of layers. Services of a layer, reliable vs. unreliable, connection-oriented vs. connectionless. Internet protocol "hourglass".
- Time-space diagram. Network performance measures.
- Network standardization: key players, standard documents, standardization processes.
- Routed point-to-point networks vs local broadcast-based networks. Address Resolution Protocol (ARP). Anatomy of a routing/switching device.
- Domain Name Service (DNS) and Dynamic Host Configuration Protocol (DHCP),
- IP Subnets, prefix and subnet mask.
- Static routing, routing table. Routing loops. Classless InterDomain Routing (CIDR), private IP addresses.
- Basics of bridging and L2 switching, resilience and scaling of bridged networks: spanning tree protocols, VLANs.
Application Protocol Design and Implementation
- Client and server, ports, well-known and ephemeral ports. Application layer protocol architecture
- Networked application programming. Socket API. Handling of concurrent requests.
- World-wide web, historical evolution, HTTP.
- Email, SMTP, IMAP, POP-3, webmail. MIME.
- Network Management, SMTP, Software Defined Networks (SDNs).
- Intro to network security. Encryption, goals, categories of encryption methods, public/private key cryptography, man-in-the-middle attack
- Encryption methods, authentication, message integrity, cryptographic hash functions.
- Public key certificates, certificate authority.
Principles of Reliable Transport - Transport Layer
- Functions of the layer, principles of reliable transport, ARQ. Congestion control, offered vs carried load diagram, load vs latency diagram.
- Principles of congestion control. Transmission Control Protocol (TCP).
- TCP session management, TCP flow control.
- TCP network congestion control, TCP variants. Fairness. UDP.
- User Datagram Protocol (UDP).
- TCP alternatives, QUIC.
- Transport Layer Security (TLS).
Routing and the Network Layer
- Fundamental concepts and services. Internet Protocol (IP). IP fragmentation.
- Internet Control Message Protocol (ICMP).
- Operations of link state and distance vector routing protocols, scaling routing protocols, Autonomous System, RIP, OSPS, BGP-4
- QoS in IP networks, TOS field and Differentiated Services.
- Multicasting, multicast routing, content delivery networks (CDNs).
- Circuit vs packet switching. Virtual circuit switching, MPLS.
Link and Physical Layers
- Basic concept, Data Link Control (DLC) and Media Access Control (MAC). Deterministic and stochastic (random) access methods, CSMA/CD.
- Ethernet/IEEE 802.3, frame format, nomenclature, historical evolution.
- Wireless networks, IEEE 802.11 - basic concepts. Hidden terminal problem, CSMA/CA.