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Questions and Answers
What is the primary function of the Data Link Layer in computer networks?
What is the primary function of the Data Link Layer in computer networks?
Which protocol is known for its collision detection capability in Ethernet networks?
Which protocol is known for its collision detection capability in Ethernet networks?
What is the purpose of the Media Access Control (MAC) sublayer in the Data Link Layer?
What is the purpose of the Media Access Control (MAC) sublayer in the Data Link Layer?
Which wireless LAN standard is defined by the IEEE 802.11 family?
Which wireless LAN standard is defined by the IEEE 802.11 family?
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In computer networking, what does OSPF stand for?
In computer networking, what does OSPF stand for?
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What is the main purpose of Border Gateway Protocol (BGP) in internet routing?
What is the main purpose of Border Gateway Protocol (BGP) in internet routing?
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Study Notes
Computer Networks (UCAIL209)
Data Link Layer
- Provides services such as framing, error detection and correction, flow control, and multiplexing
- Design issues include frame size, error detection and correction, and flow control
Framing
- A frame is a formatted unit of data transmitted over a network
- Framing methods include:
- Fixed-size framing
- Variable-size framing
- Bit-oriented framing
- Character-oriented framing
ARQ Protocol
- Automatic Repeat Request (ARQ) protocol is used for error detection and correction
- Classification chart:
- Stop-and-Wait ARQ
- Go-Back-N ARQ
- Selective Repeat ARQ
MAC and LLC Sublayers
- Medium Access Control (MAC) sublayer resolves collisions and manages network access
- Logical Link Control (LLC) sublayer provides flow control, error detection, and correction
- Static MAC: permanently assigned MAC addresses
- Dynamic MAC: dynamically assigned MAC addresses
ALOHA
- ALOHA is a protocol for managing access to a shared network channel
- Pure ALOHA: sends data packets without checking for collisions
- Slotted ALOHA: divides time into slots and sends data packets in slots
Multiple Access Control
- CSMA (Carrier Sense Multiple Access) protocol: listens for collisions before transmitting data
- CSMA/CD (Collision Detection): carrier sense and collision detection
- CSMA/CA (Collision Avoidance): carrier sense and collision avoidance
- IEEE 802.11 wireless LAN standards: managing wireless network access
Network Layer
- Provides services to Transport layer such as routing, addressing, and congestion control
- Functions: routing, addressing, congestion control, and fragmentation
Routing
- Shortest path routing algorithm: finds the shortest path between source and destination
- Flow-based routing: forwards packets based on flow information
- OSPF (Open Shortest Path First): link-state routing protocol
- IP address classes: Class A, B, C, D, and E
Border Gateway Protocol (BGP)
- BGP is a routing protocol used for exchanging routing information between networks
- How BGP works: advertises routes, selects best path, and updates routing tables
Other Concepts
- Crash recovery: recovering from a network failure
- Choke packets: used to control congestion in networks
- Jitter control: managing packet delay variation in networks
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Description
Test your knowledge on the services provided by Data Link Layer, design issues, framing methods, ARQ protocol, MAC and LLC sub layers, static and dynamic MAC, and ALOHA protocol. This quiz covers a range of topics related to Computer Networks.
