me test

Question

Which of the following statements about Link State Protocol (LSP) is/are true?

S1 : If LSP data is less recent than the data stored in database, then the new LSP packet is updated with data stored in database and is flooded to channels.

S2 : If LSP data is not in database, then data is stored and LSP packet is forwarded over all interfaces but not to the one on which it was received
a. Only S1
b. Only S2

c. Both.
d. N.o.t

Comments

i think both are true ??

Answer 1

LSP sent when:

1.A router contacts a new neighbour router

2. A link fails

3. The cost of a link changes

4. Periodically every fixed time interval

 LSPs have timestamps and sequence numbers so that:

1. forwarded packets are not forwarded again

2. allow correct ack by receiver

When LSP received:

Router examines fields of the LSP: link identifier,metric,timestamp or sequence number

If LSP data not in database, data is stored and LSP is forwarded over all interfaces but the one on which it was received

 Same happens if LSP data is in database, but it is more recent than data about this link contained in database.

If LSP data is less recent than data stored in database, new LSP with data stored in database is sent back only over the link from which the first LSP was received

If LSP data is the same as database data, no operation is performed.

Comments

what does it means ?

 "If LSP data is not in database"

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Link state protocol , uses topology database which stored all paths information and then added to translation table or routing table.

Any LSP come it first check with database ...