Flashcards in Chapter_8 part_2 Deck (18):
authentication for ospf: null?
no authentication used
authentication for ospf?: simple
plaint text authentication... older technology. password is sent in the update (ospf) in plain txt.
authentication for ospf: MD5 authentication
password is never exchanged between peers, most secure method. password is calculated used md5 algorithms.
Database Descriptor packet
what 2 states should ospf be in for log period of time?
2-way and full state
what is 2-way state in ospf?
means the router has sent and received hello packets with its neighbor. stays in this state with all routers except the DR or BDR where it is in a state of Full (when on a broadcast network).
what is Full state in ospf?
routers are fully adjacent (routers have converged) with each other. All the router and network LSAs are exchanged and the routers' databases are fully synchronized. **the router should always be in full state unless the network is a broadcast network and then it is in 2-way state with all neighbor routers except the DR or BDR.
default administrative distance 110 is what?
what command do u use to reset the ospf neighbor adjacency without resetting/restarting the router?
clear ip ospf 'process-id' process
with the following command what is shown?show ip route ospf
displays only the ospf learned routes in the routing table.
what does this command display? show ip ospf
process id, router id, ospf earea info. and last time spf algorithm was processed.
what command do u use to see the ospf paramaters configured on an interface, ospf process id, areas that the interfaces are in, cost of int., hello and dead intervals?
show ip ospf interface
what command is used to: see neighbor router id, neighbor priority, ospf state, dead timer, neighbor int. address.
show ip ospf neighbor
the command shows what? show ip protocols
ospf process id, router id, networks the router is advertising, default admin. distance, etc...
if the following command is set on an interface what occurs? passive-interface
ospf routing updates are not able to pass between or out that interface. this keeps adjacency tables from forming and can cause ospf neighbor issues. **disable using the np passive-interface command
what is MTU?
The MTU size is the largest network layer packet that the router will forward out each interface. if the MTU does not match between interfaces on the same line then an adjacency in ospf will fail.
show ipv6 protocols
OSPFv3 process ID, the router ID, and the interfaces the router is receiving updates from