Anna University Coimbatore 2009 B.E Electronics

The 3 keys for understanding the algorithm are
· Knowledge about the whole networks
· Routing only to neighbors
· info sharing at regular intervals
19. Write the keys for understanding the link state routing.
The 3 keys for understanding the algorithm are
· Knowledge about the neighborhood.
· Routing to all neighbors.
· info sharing when there is a range.
20. How the packet cost referred in distance vector and link state routing?
In distance vector routing, cost refer to hop count while in case of link state
routing, cost is a weighted value based on a variety of factors such as security levels, traffic
or the state of the link.
21. How the routers get the info about neighbor?
A router gets its info about its neighbors by periodically sending them a
short greeting packets. If the neighborhood responds to the greeting as expected, it is
presumed to be alive and functioning. If it dose not, a change is presumed to have occurred
and the sending router then alerts the rest of the network in its next LSP.
22. elaborate the 4 internetworking devices?
The 4 internetworking devices are,
· Repeaters
· Bridges
· Routers
· Gateway
23. describe IP address.
IP address is the 3-bit number for representing a host or system in the network.
One portion of the IP address shows a networking and the other represents the host in a
network.
24. What is Token Bus?
Token Bus is a physical bus that operates as a logical ring using tokens. Here
stations are logically organized into a ring. A token is passed among stations. If a station
wants to send data, it must wait and capture the token. Like Ethernet, station communicates
via a common bus.
25. What is token passing?
Stations may attempt to send data multiple times before a transmission makes it
onto a link. This redundancy may create delays of indeterminable length if the traffic is
heavy. Token ring resolves this uncertainty by requiring that stations take turns sending
data. every station may transmit only during its turn and may send only 1 frame during
every turn. The mechanism that coordinates this rotation is called token passing.
26. describe Masking?
Masking is the process that extracts the address of the physical network from an
IP address.
27. elaborate the rules of boundary-level masking?
The rules of boundary-level masking
· The bytes in the IP address that corresponds to 255 in the mask will be

Earning:   Approval pending.