Access Computer Networks important questions 2024
UNIT I:
Introduction: Network Types, LAN, MAN, WAN, Network Topologies Reference models- The OSI
Reference Model- the TCP/IP Reference Model – A Comparison of the OSI and TCP/IP Reference Models,
OSI Vs TCP/IP, Lack of OSI models success, Internet History.
Physical Layer –Introduction to Guided Media- Twisted-pair cable, Coaxial cable and Fiber optic cable
and unguided media: Wireless-Radio waves, microwaves, infrared.
UNIT II:
Data link layer: Design issues, Framing: fixed size framing, variable size framing, flow control, error
control, error detection and correction codes, CRC, Checksum: idea, one’s complement internet checksum,
services provided to Network Layer, Elementary Data Link Layer protocols: simplex protocol, Simplex
stop and wait, Simplex protocol for Noisy Channel.
Sliding window protocol: One bit, Go back N, Selective repeat-Stop and wait protocol, Data link layer in
HDLC: configuration and transfer modes, frames, control field, point to point protocol (PPP): framing
transition phase, multiplexing, multi link PPP.
UNIT III:
Media Access Control: Random Access: ALOHA, Carrier sense multiple access (CSMA), CSMA with
Collision Detection, CSMA with Collision Avoidance, Controlled Access: Reservation, Polling, Token
Passing, Channelization: frequency division multiple Access(FDMA), time division multiple
access(TDMA), code division multiple access(CDMA).
Wired LANs: Ethernet, Ethernet Protocol, Standard Ethernet, Fast Ethernet(100 Mbps), Gigabit Ethernet,
10 Gigabit Ethernet.
UNIT IV:
The Network Layer Design Issues – Store and Forward Packet Switching-Services Provided to the
Transport layer- Implementation of Connectionless Service-Implementation of Connection Oriented
Service- Comparison of Virtual Circuit and Datagram Networks, Routing Algorithms-The Optimality
principle-Shortest path, Flooding, Distance vector, Link state, Hierarchical, Congestion Control algorithms-General principles of congestion control, Congestion prevention polices, Approaches to Congestion Control-Traffic Aware Routing- Admission Control-Traffic Throttling-Load Shedding. Traffic Control Algorithm-Leaky bucket & Token bucket.
Internet Working: How networks differ- How networks can be connected- Tunnelling, internetwork
routing-, Fragmentation, network layer in the internet – IP protocols-IP Version 4 protocol-IPV4 Header
Format, IP addresses, Class full Addressing, CIDR, NAT-, Subnets-IP Version 6-The main IPV6 header,
Transition from IPV4 to IPV6, Comparision of IPV4 & IPV6- Internet control protocols- ICMP-ARPDHCP
UNIT V:
The Transport Layer: Transport layer protocols: Introduction-services- port number-User data gram
protocol-User datagram-UDP services-UDP applications-Transmission control protocol: TCP services-TCP features- Segment- A TCP connection- windows in TCP- flow control-Error control, Congestion
control in TCP.
Application Layer –- World Wide Web: HTTP, Electronic mail-Architecture- web based mail- email
security- TELENET-local versus remote Logging-Domain Name System: Name Space, DNS in Internet ,-
Resolution-Caching- Resource Records- DNS messages- Registrars-security of DNS Name Servers, SNMP.
Computer Networks important questions 2024
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