Is OSPF inter or intra-domain protocol?

Inter - between different things, like international. BGP ist inter-domain protocol.

Intra - within, inside. OSPF is a intra-domain protocol.

Which information belongs to the link state of a router interface?

• Link type (is it point-to-point link, and another router is attached, or a stub network is attached)

• IP address of interface (for point-to point link)

• ID of neigbour router (for point-to point link)

• IP address of network (if stub network is attached to link)

• Link cost

  

  

  1. R1 received no Hello-packages from R0 for a while, and the entry correponding to link to R0 expires
  2. Yes, each router maintains the topology map of the network to calculate the shortest path

  R1 detects the failure of its link to router R0 and sends the corresponding LSA.

  

  LS Age: always 0 when origin sends. Incremented, when R3 retransmits it to following routers

  Fill routing table

  

  

  Explanation:

  ABR1 can be reached via R1 with 5+15+5=25 costs

  ABR2 via R3 with 5+1=6

  D via ABR1 (smallest cost of ABR1 to D), hense R3

  E via ABR2 (smallest cost of R4 to ABR, ABR1 to E and ABR2 to E costs are equal)

  S only via R1