Anna University , Chennai
Department of B.E-Computer Science and Engg
(Common to I.T Department)
Fifth Semester
CS2302 Computer Networks
Scanned Lecture Notes (All Units) - Suba Edition
(Regulation 2008)
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UNIT-1
NETWORK ARCHITECTURE LAYERS
Computer network
Point to point
Multiple point
Switched network
Channels
1. Request or replay channel
2. Message stream channel
Communication
1. Simplex
2. Half duplex
3. Full duplex
Client or server
Protocols
Types
1. TCP
2. UDP
Topology
NETWORK ARCHITECTURE
Layering and protocols
Interfaces
Protocols graph
OSI ARCHITECTURE
Function of layers
1. Physical layer
2. Data link layer
3. Network layer
4. Transport layer
5. Session layer
Dialog control
Presentation layer
Translation
Application layer
PHYSICAL LINKS
Transmission media
1. Guided media
a. Twisted pair
b. Co-axial cable
c. Fiber optic cable
2. Unguided media
CHANNEL ACCESS ON LINKS
Multiplexing
Application
Types
1. FDMA (frequency division multiple access)
2. TDMA (time division multiple access)
3. CDMA (code division multiple access)
ERRORS
1. Single error
2. Burst error
3. Burst error
REDUNDANCY
ERROR DETECTION TECHNIQUE
1. Parity check
2. Simple parity check
3. Two dimensional parity check
Vertical redundancy check
Cyclic redundancy check
Checksum
Error correction
Link level flow control
1. Flow control
a. Stop and wait
b. Sliding window
2. Error control
a. Stop and wait
b. Sliding window
i. Go back ARQ
ii. Selective reject RQ
Flow control
1. Normal operation
2. Lost and damaged frame
3. Lost acknowledgement
4. Delayed acknowledgement
Piggy packing
FRAMING
Classification
1. Byte oriented protocol
a. PPP
b. Sentinel approach protocol
2. Bit oriented protocol
a. SDLC (synchronous data link control)
b. HDLC (high level data link control )
c. LAP (link approach protocol)
d. LAN (local area network)
UNIT-2
Medium access
CSMA
Inter frame space
Token ring
Ring interface
Two modes
1. Listen mode
2. Transmit mode
Token passing
Frame format
Token format
FDDI (fiber distributed data interface)
Access method
FDDI layer
Frame types
Wireless LAN
Technologies
1. Bluetooth
2. Wi-Fi
3. Wi-Max
4. SG cellular wireless
Bridges and LAN switches
Types
1. Transport bridge
2. Source routing bridge
UNIT-3
Switching
1. Circuit switching
2. Packet switching
3. Message switching
Global addressing
Address resolution protocol (ARP)
Client server arch
Queuing discipline
FIFO
Routing algorithm
1. Next hop routing
2. Network specific routing
3. Host specific routing
Link state routing
DIJIKSTRA ALGORITHM
IPV6
Transition from IPV4 to IPV6
Dual stack
Tunneling
Header transition
IPV6 header
BGP (border gateway protocol)
BGP router
Conjetion avoidance in network layer
Two catagories
1. Open loop
2. Close loop
DHCP frame format
DHCP messages
UNIT-4
UDP (User Datagram Protocol)
UDP message queue
TCP
TCP segment format
Connection
State transition diagram
Adaptive flow control
Receiver window
Silly window syndrome
Syndrome created by Rx
Syndrome created by sender
Multiplication decrease
Four cases of congestion
QOS
Method of QOS
1. Scheduling
a. FIFO queuing
b. Priority queuing
c. Weighted fair queuing
2. Traffic shaping
a. Leaky bucket
b. Token bucket
3. Admission control
4. Resource reservation
UNIT-5
Receiving mail
User agent
Services of UA
User agent type
MIME (multipurpose internet mail extensions)
MIME header
Content type
Content transfer encoding
MTA (mail transfer agent)
Phases in mail transfer
Mail\delivery
IMAP (internet mail access protocol)
POP (post office protocol)
HTTP (hypertext transfer protocol)
Request message
Request line
Request type
URL defines
1. Method
2. Host compute
3. Port
4. Path
Header
1. General header
2. Request header
3. Response header
4. Entity header
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