Week 7 UAS

Question 1

What is Interior Routing Protocol?

Answer 1

Routing protocols that operate within a network (called an autonomous system) are called interior routing protocols.

Question 2

What is Exterior Routing Protocol?

Answer 2

used for operating outside of or between networks

Question 3

What is Routing?

Answer 3

• Routing is the process of deciding what path to take from sender to receiver (packet forwarding).
• usually there is more than one route possible; devices that perform routing must keep tables to make decisions about which path to send packets.
• Handled by Routers that maintain their own routing tables
• Routing tables indicates next route to which datagram should be sent

Question 4

What is DHCP?

Answer 4

The Dynamic Host Configuration Protocol (DHCP) is a standardized network protocol used on Internet Protocol (IP) networks for dynamically distributing network configuration parameters, such as IP addresses for interfaces and services.

Question 5

Routing Information Protocol (RIP)

Answer 5

RIP commonly used on the Intenet.

• Computers using RIP broadcast routing tables every minute or so.
• The original dynamic distance vector protocol

Question 6

Open Shortest Path First (OSPF)

Answer 6

Has overtaken RIP as the most popular interior routing
protocol on the Internet
• Has the ability to incorporate traffic and error rate
measures in its routing decisions.
• Sends updates state info, not entire routing tables, and
only to other routers (not broadcasting them)
• Each router keeps list of state of local links to network
• Little traffic (less burdensome to the network since) as
messages are small and not sent often
• Route computed on least cost based on user cost
metric using Link State Routing Algorithm

Question 7

Dynamic Routing Algorithms. ada 2

Answer 7

1. Distance Vector: use the least number of hops to decide how to route a packet. first generation routing algorithm for ARPANET
2. Link State: use a variety of information types and takes into account such factors as congestion and response time to decide how to route a packet.
   Link state more popular than distance vector

Question 8

Difference between distance vector and link state?

Answer 8

Distance Vector:

• each node exchange information with neighbouring nodes.
• node maintains vector of link costs for each directly attached network and distance and next-hop vectors for each destination
• requires transmission of lots of information by each router

Link state:

• designed to overcome drawbacks of distance vector.
• when router initialized, it determines link cost on each interface
• each router can construct topology of entire configuration and can calculate shortest path to each destination network.