Annex C13 Ethernet

Question 0

Functions of Address Resolution Protocol (ARP)

Answer 0

Relies on certain types of Ethernet broadcast messages and Ethernet unicast messages

2 basic functions:

- Resolving IPv4 addresses to MAC addresses
- Maintaining a table of mappings

Sending node needs a way to find the MAC address of the destination for a given Ethernet link.

Question 1

Data Link Layer Media Access Control (MAC) addressing and Network Layer IP addressing

Answer 1

Globally unique for each ethernet device, cannot be changed by software

Physical address (MAC) vs Logical Address (IP) = letter with your name vs letter with your home address

Question 2

Switches vs Hubs

Answer 2

Switch: segments the collision domain to prevent collisions from happening (preferred for connecting computers) Allows for higher overall throughput because the losses due to collisions have been greatly reduced

Hubs: operate at the layer one and simply extend the collision domain by adding multiple nodes to one connection. Older technology superseded by switches