Computer Networks 1: Data Link Layer (Layer 2 of OSI)

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What is the purpose of the error detection and correction bits (EDC) in the link layer protocol?

To compress the data packets for efficient transmission

To prioritize the transmission of important data packets

To improve the speed of data transmission

To detect and correct errors in the transmitted data (correct)

What is the primary difference between half-duplex and full-duplex communication?

The direction of data transmission (correct)

The frequency of data transmission

The type of data being transmitted

The number of nodes in the network

What is the purpose of the Internet checksum at the transport layer?

To detect errors in data transmission (correct)

To prioritize data packets

To compress data packets

To increase data transmission speed

What happens when the receiver detects errors in the received data?

It requests retransmission of the data Signup and view all the answers

Where is the link layer protocol implemented?

In the adapter (NIC) Signup and view all the answers

What is the limitation of error detection mechanisms?

They are not 100% reliable Signup and view all the answers

What is the primary responsibility of the data-link layer?

Transferring datagrams from one node to another over a link Signup and view all the answers

What is the term used to describe the process of adding a header and trailer to a datagram?

Framing Signup and view all the answers

What is the purpose of 'physical addresses' in frame headers?

To identify source and destination nodes Signup and view all the answers

What is the main reason for error detection in the data-link layer?

Signal attenuation Signup and view all the answers

What is the term used to describe the process of controlling the pace of data transmission between nodes?

Flow control Signup and view all the answers

What is the term used to describe the data unit of the data-link layer?

Frame Signup and view all the answers

What is the primary purpose of a 32-bit IP address?

To get a datagram to a destination IP network Signup and view all the answers

What is the primary function of ARP?

To translate IP addresses to MAC addresses Signup and view all the answers

What is unique about each adapter on a LAN?

Its MAC address Signup and view all the answers

What is the purpose of MAC address allocation?

To ensure MAC address uniqueness Signup and view all the answers

Why is a MAC address considered portable?

Because it is a flat address Signup and view all the answers

What is the analogy for a MAC address?

A Social Security Number Signup and view all the answers

What is the purpose of the ARP protocol?

To determine the MAC address of a node given its IP address Signup and view all the answers

What is the purpose of the TTL in an ARP table?

To set a timer for when the mapping will be forgotten Signup and view all the answers

What happens when a node receives an ARP query packet?

It sends a response with its MAC address Signup and view all the answers

What is the purpose of the preamble in an Ethernet frame?

To synchronize the receiver and sender clock rates Signup and view all the answers

What happens when a node receives an Ethernet frame with a non-matching destination address?

It discards the frame Signup and view all the answers

What is the purpose of the CRC in an Ethernet frame?

To detect errors in the frame Signup and view all the answers