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MAC Protocols: Polling and Token Passing

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MAC Protocols: Polling and Token Passing

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Questions and Answers

What is the main advantage of random access MAC protocols at low load?

They can handle high-load situations efficiently

A single node can fully utilize the channel (correct)

They are less prone to single point of failure

They are suitable for use with 'dumb' slave devices

What is the main concern of 'taking turns' MAC protocols?

Polling overhead

Token overhead

Collision overhead

Latency and single point of failure (correct)

What is the purpose of a MAC address?

Used for flow control in LANs

Used for error detection and correction

Used 'locally' to get a frame from one interface to another physically-connected interface (correct)

Used for layer 3 (network layer) forwarding

Who administers the allocation of MAC addresses?

IEEE (B) Signup and view all the answers

What is the advantage of a flat MAC address?

It is easier to move LAN cards between LANs without changing MAC (C) Signup and view all the answers

How many bits are typically used to represent a MAC address in most LANs?

48-bit (B) Signup and view all the answers

What is the primary purpose of the ARP protocol?

To resolve IP addresses to MAC addresses (B) Signup and view all the answers

What is the significance of the TTL value in an ARP table?

It specifies the time after which the address mapping will be forgotten (B) Signup and view all the answers

What happens when a device receives an ARP query packet containing its IP address?

It sends a response packet with its MAC address (D) Signup and view all the answers

Why is it necessary to have a unique MAC address for each adapter on a LAN?

To facilitate communication between devices on the same LAN (A) Signup and view all the answers

What is the purpose of the ARP table in a device?

To store the IP/MAC address mappings for some LAN nodes (C) Signup and view all the answers

What happens to the information in the ARP table?

It times out unless refreshed (B) Signup and view all the answers

What is the purpose of ARP?

To resolve IP addresses to MAC addresses (C) Signup and view all the answers

What is the destination MAC address in the link-layer frame sent from A to R?

E6-E9-00-17-BB-4B (D) Signup and view all the answers

What is the source MAC address in the link-layer frame sent from R to B?

1A-23-F9-CD-06-9B (A) Signup and view all the answers

Why is Ethernet considered a dominant wired LAN technology?

It has kept up with the speed race from 10 Mbps to 10 Gbps (A) Signup and view all the answers

What is the purpose of the Ethernet frame structure?

To encapsulate IP datagrams in Ethernet frames (A) Signup and view all the answers