Network Security

Computer Network and Security

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Course Title: Computer Network and Security

Course No: CT 702

Nature of the Course: Theory + Lab

Semester: 7

Full Marks: 80 + 20

Pass Marks: 32 + 8

Credit Hours: 45

Course Description

This course covers computer network fundamentals through the OSI/TCP-IP layered model, spanning physical transmission, data link, network, transport, and application layer protocols. It includes routing, addressing, IPv6, and network security topics like cryptography, VPNs, and firewalls. Hands-on labs cover LAN setup, router configuration, VLANs, and server deployment.

Course Objectives

To understand the concepts of computer networking, functions of different layers and protocols, and know the idea of IPV6 and security.

Course Contents

1. Introduction to Computer Network

5 hrs

1.1. Uses of Computer Network

1.2. Networking model client/server, p2p, active network

1.3. Protocols and Standards

1.4. OSI model and TCP/IP model

1.5. Comparison of OSI and TCP/IP model

1.6. Example network: The Internet, X.25, Frame Relay, Ethernet, VoIP, NGN and MPLS, xDSL.

2. Physical Layer

5 hrs

2.1. Network monitoring: delay, latency, throughput

2.2. Transmission media: Twisted pair, Coaxial, Fiber optic, Line-of-site, Satellite

2.3. Multiplexing, Circuit switching, Packet switching, VC Switching, Telecommunication switching system (Networking of Telephone exchanges)

2.4. ISDN: Architecture, Interface, and Signaling

3. Data Link Layer

5 hrs

3.1. Functions of Data link layer

3.2. Framing

3.3. Error Detection and Corrections,

3.4. Flow Control

3.5. Examples of Data Link Protocol, HDLC, PPP

3.6. The Medium Access Sub-layer

3.7. The channel allocation problem

3.8. Multiple Access Protocols

3.9. Ethernet,

3.10. Networks: FDDI, ALOHA, VLAN, CSMA/CD, IEEE 802.3(Ethernet), 802.4(Token Bus), 802.5(Token Ring), and 802.1(Wireless LAN).

4. Network Layer

9 hrs

4.1. Internetworking &devices: Repeaters, Hubs, Bridges, Switches, Router, Gateway

4.2. Addressing: Internet address, classful address

4.3. Subnetting

4.4. Routing: techniques, static vs. dynamic routing , routing table for classful address

4.5. Routing Protocols: RIP, OSPF, BGP, Unicast and multicast routing protocols

4.6. Routing algorithms: shortest path algorithm, flooding, distance vector routing, link state routing; Protocols: ARP, RARP, IP, ICMP

5. Transport Layer

5 hrs

5.1. The transport service: Services provided to the upper layers

5.2. Transport protocols: UDP, TCP

5.3. Port and Socket

5.4. Connection establishment, Connection release

5.5. Flow control & buffering

5.6. Multiplexing & de-multiplexing

5.7. Congestion control algorithm: Token Bucket and Leaky BucketTransport Layer

6. Application Layer

5 hrs

6.1. Web: HTTP & HTTPS

6.2. File Transfer: FTP, PuTTY, WinSCP

6.3. Electronic Mail: SMTP, POP3, IMAP

6.4. DNS

6.5. P2PApplications

6.6. Socket Programming

6.7. Application server concept: proxy caching, Web/Mail/DNS server optimization

6.8. Concept of traffic analyzer: MRTG, PRTG, SNMP, Packet tracer, Wireshark.

7. Introduction to IPV6

4 hrs

7.1. IPv6- Advantages

7.2. Packet formats

7.3. Extension headers

7.4. Transition from IPv4 to IPv6: Dual stack, Tunneling, Header Translation

7.5. Multicasting

8. Network Security

7 hrs

8.1. Properties of secure communication

8.2. Principles of cryptography: Symmetric Key and Public Key

8.3. RSA Algorithm,

8.4. Digital Signatures

8.5. Securing e-mail (PGP)

8.6. Securing TCP connections (SSL)

8.7. Network layer security (IPsec, VPN)

8.8. Securing wireless LANs (WEP)

8.9. Firewalls: Application Gateway and Packet Filtering, and IDS

Laboratory Works

1.Network wiring and LAN setup
2.Router Basic Configuration
3.Static and Dynamic Routing
4.Creating VLAN
5.Router access-list configuration
6.Basic Network setup on Linux
7.Setup of Web Server, DNS Server, DHCP Server
8.Virtualizations

Text Books

1.A.S. Tanenbaum, “Computer Networks”, 3rd Edition, Prentice Hall India, 1997.
2.W. Stallings, “Data and Computer Communication”, Macmillan Press, 1989.
3.Kurose Ross, “Computer Networking: A top down approach”, 2nd Edition, Pearson Education
4.Larry L. Peterson, Bruce S. Davie, “Computer Networks: A Systems Approach”, 3rd Edition, Morgan Kaufmann Publishers

Notes:

This syllabus follows the official BCT curriculum of Tribhuwan University. In case of any doubt or revision, the university's published syllabus shall be considered authoritative.