Flashcard Set Preview
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| 1 |
In OSPF, what is a grouping of contiguous networks and routers called?
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OSPF area
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| 2 |
How do OSPF routers become neighbours/adjacent?
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When each router sees the other's HELLO packets.
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| 3 |
Commands to enable OSPF process 1 on router connected to 10.0.0.0 in area 0?
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router ospf 1
network 10.0.0.0 0.255.255.255 area 0
(If single area, area is always 0)
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| 4 |
What is OSPF routers in area 0 called?
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Backbone router.
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| 5 |
1) What is OSPF router connecting area 0 and other area called?
2) What is OSPF router connecting...
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1) ABR (Area Border Router).
2) ASBR (Autonomous System Boundary Router).
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| 6 |
What is OSPF router which is elected to spread /receive routing info to/from remaining routers...
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DR (Designated Router)
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| 7 |
What is OSPF router which is standby for DR called?
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BDR (Backup Designated Router)
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| 8 |
What is OSPF data packet containing link-state and routing information to maintain topological...
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LSA (Link State Advertisement)
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| 9 |
What is algorithm OSPF use to calculate best/shortest path?
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SPF (Shortest Path First)
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| 10 |
What is default OSPF Hello and Dead timers?
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OSPF Hello - 10 secs
OSPF Dead - 40 secs
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| 11 |
What is OSPF Hello multicast address?
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224.0.0.5
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| 12 |
Commands to change priority of int f0/1 to 2?
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int f0/1
ip ospf priority 2
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| 13 |
Commands to configure a loopback int using 172.16.10.1?
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int loopback 0
ip address 172.16.10.1 255.255.255.255
no shutdown
(255.255.255.255 is Host...
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| 14 |
In OSPF, what is list of all OSPF routers for which Hello packets have been seen, i.e. adjacency...
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Neighbor table.
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| 15 |
In OSPF, what is list of all of LSA packets received for an area, i.e. link-state table?
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Topology table.
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| 16 |
What is OSPF forwarding table called?
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Routing table.
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| 17 |
What 2 types of network have DR and BDR assigned?
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Broadcast & NBMA
(no Point-to-Point/Multipoint types)
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| 18 |
Commands to set OSPF cost 10 for both f0/1 and f0/2 to load-balance?
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int f0/1
ip ospf cost 10
int f0/2
ip ospf cost 10
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| 19 |
Commands to configure OSPF plain-text authentication using password cisco on s0/0?
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int s0/0
ip ospf authentication-key cisco
ip ospf authentication
!
router ospf 1
area...
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| 20 |
Commands to configure OSPF MD5 authentication for key 1 using password cisco on s0/0?
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int s0/0
ip ospf message-digest-key 1 md5 cisco
ip ospf authentication message-digest
!
router...
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| 21 |
Command to display lists the OSPF area in which the interface belongs, neighbors adjacent...
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show ip ospf interface
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| 22 |
Command to show list of OSPF neighbors per inteface basis and adjacency state including DR/BDR?
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show ip ospf neighbor
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| 23 |
Command to analise OSPF events, showing messages for each OSPF packet?
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debug ip ospf events
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| 24 |
Command to show log messages that describe the contents of all OSPF packets?
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debug ip ospf packets
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| 25 |
Command to display messages describing OSPF Hello packets and Hello failures?
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debug ip ospf hello
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| 26 |
Command to show the authentication process if OSPF authentication is configured. Hello packet...
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debug ip ospf adj
(adj = adjacencies)
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| 27 |
Command to display topology database (number of routers in AS and nighbouring router's ID),...
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show ip ospf database
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| 28 |
Command to change RID to 1.1.1.1 in OSPF 1?
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router ospf 1
router-id 1.1.1.1
(loopback int will not overide this)
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| 29 |
What is OSPF metric?How to calculate it?
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Bandwidth/cost10*8/bandwidth (10*8/64000=1562)
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| 30 |
What is the state of a route when Hold Down Timer is set?
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Possibly down
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| 31 |
How often does OSPF send routing updates?
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Only when changes are made.
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| 32 |
Command to restart OSPF process without rebooting router?
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clear ip ospf process
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| 33 |
How many LSAs exist in OSPF?What are Type1 and Type2?
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8.Type1 = Router LSA generated by routerType2 = network LSA generated by DR/BDR
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| 34 |
What does AuType set to 0/1/2 mean?
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0) Authentication is Null1) Authentication is Plain-text2) Authentication is MD5
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