Address Assignment

Question 1

Are routable network layer(IP) addresses unique network wide?

Answer 1

Yes

Question 2

are link-layer addresses unique link wide?

Answer 2

Yes

Question 3

What is the Dynamic Host Configuration Protocol(DCHP)?

Answer 3

DHCP works at the application layer to dynamically assign IP address to the client through a 4 step process: Discovery(client broadcasts message to discover DHCP server), Offer(DHCP server does DAD then offers IP address), Request(client requests offered IP adress), and Acknowledgement(server acknowledges request and assigns IP address to client)

Question 4

When can DHCP be used?

Answer 4

as long as each host can be reached from a DHCP server, otw it will not get an IP address

Question 5

How do you avoid misrouting due to duplicate addressing in ad-hoc networks?

Answer 5

Using weak DAD(duplicate address detection), packets from a given host to a given address should be routed to the same destination, despite the duplication, expected low overhead.

Question 6

weak DAD with DSR

Answer 6

Each host has a very likely unique key that may include MAC address, serial number, put in all routing related packets with the IP address as a pair. When a host becomes aware of two pairs with matching IP but not keys, detects address duplication.

Question 7

what are the issues with weak DAD?

Answer 7

duplicate MAC addresses(within two hops), network layers performing unicasts using flooding, limited time address leases(DHCP)