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CCNP Route
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Subjects
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cisco
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it-skills
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ccnp
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Keepalive
The command is applied on all routers in the area.
BGP peers exchange keepalive messages every 60 seconds by default. These keep the peering session active.
A transit AS is an AS through which traffic to another AS travels - such as with an ISP.
Router# clear ip bgp ip-address soft out
2. You need to suppress the periodic Hellos so that an ISDN link is not constantly enabled in a dial-on-demand routing (DDR) environment. What feature of OSPF should you use?
BGP is a path-vector protocol
On-demand circuit is an enhancement that allows efficient operations over dialup - ISDN - and other on-demand circuits.
Link flapping - Network type being broadcast - PPP host route being redistributed - One router being not demand-circuit capable
The minimum metric of the specific routes is used as the metric of the summary route.
3. You need to distribute select BGP prefix information as specified in a prefix-list. What command do you use to enact this?
A site with two connections to multiple ISPs. This gives the most redundancy. BGP is used with the ISPs and can be used internally also.
The AD is the cost between that next hop router and the destination.
Router(config-router)# neighbor {ip-address | peer-group-name} prefix-list prefix-listname {in | out}
The router responds with an update of the routing information it possesses.
4. What is the formula used by OSPF for the calculation of cost?
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5. The metric of EIGRP contains a reliability component. What is the value that indicates a completely unreliable link?
Manually configured
In EIGRP - a reliability of value 1 indicates a completely unreliable link.
Exterior Gateway Protocol(EGP). BGP v4 is the only EGP currently in use.
OSPF addresses packets to multicast address 224.0.0.6.
6. You are considering manipulating the K values on an EIGRP router. Which routers in the EIGRP domain must have this configuration made?
You must manipulate the K values on all routers if you plan to manipulate them on one.
The AS External (Type 5) LSAs advertise an external destination or a default route to an external destination. These LSAs are originated by ASBRs. They are flooded throughout the autonomous system.
The command is applied on all routers in the area.
The no-summary keyword needs to be used on the ABR only.
7. Describe a multihomed network.
The ASBR Summary (Type 4) LSA advertises an Autonomous System Boundary Router (ASBR) destination. This LSA is originated at an ABR. This LSA type is flooded throughout an autonomous system.
BGP speakers
Router# clear ip bgp ip-address in
A site connected to more than one ISP at the same time. It is done for redundancy and backup if one ISP fails - and for better performance if one ISP provides a better path to frequently used networks. This also gives you an ISP-independent solution.
8. In a LAN - with which router(s) does a DROTHER form an adjacency?
Multi Exit Discriminator.
OSPF uses IP protocol number 89.
DROTHERs form an adjacency with the DR and BDR.
Route tagging with communities is always done with a route map. You can specify any number of communities. Communities specified in the set keyword overwrite existing communities unless you specify the additive option.
9. What are the three possible origin codes as specified by the origin attribute?
Interdomain routing
An OSPF stub area is an area into which External LSAs are not flooded (Type 4 and 5 LSAs are blocked.) Type 1 - 2 - and 3 LSAs are still used in a stub area.
IGP - Exterior Gateway Protocol (EGP) - Unknown
Router(config-router)# neighbor ip-address route-reflector-client
10. What command do you use in OSPF to configure inter-area route summarization on the ABR?
Use the following command to configure inter-area route summarization on the ABR: Router(config-router)# area area-id range address mask
Router(config-router)# area area-id default-cost cost
The network backdoor router configuration command causes the administrative distance assigned to the network to be forced to 200. The goal is to make Interior Gateway Protocol (IGP) learned routes preferred.
BGP peers
11. You have local BGP routing policies you can enact - and you have global autonomous system policies that you can implement. What is the purpose of local preference - local or global?
Router(config-router)# neighbor ip-address route-reflector-client
For the Broadcast Cisco mode of operation: Dynamic or manual neighbor configuration? Dynamic - DR/BDR election required? DR/BDR election
Open - Update - Keepalive - Notification
Local preference can be used to enact global autonomous system routing policies.
12. What is the administrative distance for IBGP?
200
IP network numbers and subnet masks (prefix-list or access-list) - Route originator - Next hop - Origin code - Tag value attached to an Interior Gateway Protocol (IGP) route - AS-path - Community - IGP route type
The correct command to configure a Not-So-Stubby Area in OSPF is as follows: Router(config-router)# area area-id nssa [no-redistribution] [default-information-originate]
Exterior Gateway Protocol(EGP). BGP v4 is the only EGP currently in use.
13. For the Point-to-multipoint RFC-compliant mode of operation - fill in the following information: Dynamic or manual neighbor configuration? ________ DR/BDR election required?
For the Point-to-point Cisco mode of operation: Dynamic or manual neighbor configuration? Dynamic DR/BDR election required? Not required
Interior Gateway Protocol(IGP)
Router(config-router)# neighbor ip-address shutdown
For the Point-to-multipoint RFC-compliant mode of operation: Dynamic or manual neighbor configuration? Dynamic DR/BDR election required? Not required
14. Notification
Slow neighbors are sent unicast packets in an attempt to resolve issues with slow neighbors.
Border Gateway Protocol
BGP peers
When a problem occurs that causes a router to end the BGP peering session - a notificationmessage is sent to the BGP neighbor and the connection is closed.
15. How often are Hello packets sent on a multipoint circuit with bandwidth less than T1 in an EIGRP environment?
Router(config)# ip community-list 1-99 permit|deny value [ value ... ]
Hellos are sent every 60 seconds on multipoint circuits with bandwidth less than T1.
A site that has two connections to the same ISP - either from one router or two routers. One might be primary and the other backup - or the site might load balance over both links. Either static or dynamic routing would work in this case.
IP network numbers and subnet masks (prefix-list or access-list) - Route originator - Next hop - Origin code - Tag value attached to an Interior Gateway Protocol (IGP) route - AS-path - Community - IGP route type
16. What are the actions used by an Outbound Route Filter (ORF) type of Network Layer Reachability Information (NLRI)-based filtering (type 1)?
These are Type-2 external routes. Again - they define networks outside of the autonomous system and are advertised by Type 5 LSAs. In this case cost is always the external cost only. This is the default OSPF external route type on Cisco routers.
DROTHERs form an adjacency with the DR and BDR.
The correct command is show ip bgp.
ADD - Adds a line to a prefix-list filter on the remote peer - DELETE - Removes a line from a filter that was previously installed on a remote peer - DELETE ALL - Removes all previously installed filters on the remote peer
17. Describe a single-homed network.
Use the bgp default local-preference command to change the default local preference value applied to all updates coming from external neighbors or originating locally.
The next route selection criteria is for the router to prefer the highest weight (local to router).
A site with a single ISP connection.
EIGRP stub routing is a feature that allows you to specify the routes that are propagated from the spoke.
18. What does a Type 4 LSA describe - what router produces it - and Where is it flooded by default?
Reduce the flooding of LSAs in stable topologies by setting LSAs to 'do not age' - Router(config-if)# ip ospf flood-reduction
No DR/BDR election exists in a point-to-point environment by default.
You use the following command to configure an area as Totally Stubby: Router(config-router)# area area-id stub no-summary
The ASBR Summary (Type 4) LSA advertises an Autonomous System Boundary Router (ASBR) destination. This LSA is originated at an ABR. This LSA type is flooded throughout an autonomous system.
19. Neighbor database
A list of all configured BGP neighbors. To view it - use the show ip bgp summary command.
The Database Description (DBD) packet type checks for database synchronization between routers.
Reduce the flooding of LSAs in stable topologies by setting LSAs to 'do not age' - Router(config-if)# ip ospf flood-reduction
10 seconds is the default Hello interval and the default Dead interval is 4 times that value.
20. Describe External BGP.
Message used to transfer routing information between peers. Includes new routes - withdrawn routes - and path attributes.
External BGP is a BGP peering relationship between routers in different autonomous systems.
Hellos are sent every 60 seconds on multipoint circuits with bandwidth less than T1.
These route types are OSPF inter-area routes. They define networks outside of the area of the router - but within the autonomous system. Type 3 LSAs are used to advertise these route types.
21. How do you override the cost value that is calculated for a particular interface?
For an OSPF router to advertise a default route into an area - the command default-information originate must be used. If the advertising router does not possess a default route in its routing table - you can use the always keyword to still generate
Using the default-network command - you can configure a default route for the EIGRP process so that it propagates to other EIGRP routers within the same autonomous system.
A list of paths to each network used by the router - and the next hop for each network. To view it - use the show ip route command.
Use the Router(config-if)# ip ospf cost value command to override the cost value that is calculated for a particular interface.
22. What technique can you use to ensure that a particular classless prefix is always advertised by a BGP-speaking router?
Place a static route pointing to NULL0 in the IP routing table.
Packets that require acknowledgement are as follows: Update - Query - Reply
DROTHERs form an adjacency with the DR and BDR.
The Private autonomous system number range is 64512[nd]65535.
23. What IP protocol number is used by Open Shortest Path First (OSPF)?
OSPF uses IP protocol number 89.
The Cisco mode of Broadcast requires a full mesh topology.
Multi Exit Discriminator.
The next route selection criteria is for the router to prefer the highest weight (local to router).
24. To what IP address does OSPF send packets destined for the Designated Router (DR) and Backup Designated Router (BDR) in the LAN?
EIGRP uses the multicast IP address of 224.0.0.10 for Hellos and routing updates.
OSPF addresses packets to multicast address 224.0.0.6.
Router(config-router)# area area-id default-cost cost
Origin - Next-hop - Weight - Community - Local preference - Multi Exit Discriminator (MED)
25. What key design requirement of BGP does a BGP route reflector address?
Route reflectors help address the fact that BGP requires that all BGP peers in the same autonomous system form an Internal BGP (IBGP) session with all peers in the autonomous system.
The neighbor command can be used to manually configure a neighbor in a NBMA OSPF environment. The full syntax of the command is: - Router(config-router)# neighbor ip-address [priority number] [poll-interval seconds] [cost number] [database-filter all
Router(config-router)# neighbor ip-address send-community
Using the default-network command - you can configure a default route for the EIGRP process so that it propagates to other EIGRP routers within the same autonomous system.
26. You are considering designing an area as a stub area in OSPF. Which LSA types will still flow in this area?
The BGP process injects local routes in two different ways[md]1) using the network configuration commands and 2) using redistribution by another routing protocol.
The highest IP address of an active interface is selected; any loopback interface overrides this behavior. Therefore - if you have loopback interfaces - the highest IP address on an active loopback interface is selected.
The correct command is show ip bgp.
An OSPF stub area is an area into which External LSAs are not flooded (Type 4 and 5 LSAs are blocked.) Type 1 - 2 - and 3 LSAs are still used in a stub area.
27. Name two Discretionary Well-Known BGP attributes.
The neighbor command can be used to manually configure a neighbor in a NBMA OSPF environment. The full syntax of the command is: - Router(config-router)# neighbor ip-address [priority number] [poll-interval seconds] [cost number] [database-filter all
The default value of the MED attribute is 0.
Use the Router(config-if)# ip ospf cost value command to override the cost value that is calculated for a particular interface.
Local Preference - Atomic Aggregate
28. In a LAN - to which router(s) does a DROTHER send an update?
Router(config-router)# neighbor ip-address send-community
Router(config-router)# neighbor {ip-address | peer-group-name} prefix-list prefix-listname {in | out}
Updates are sent to the DR.
This network is currently unavailable and installation cannot occur in the routing table. The router is currently searching for a replacement route.
29. You are examining the results of the show ip route command - and you notice several OSPF routes bear an O E2 route designator. What does this signify?
Use the variance command in EIGRP to control load balancing behavior[md]potentially across unequal bandwidth links.
These are Type-2 external routes. Again - they define networks outside of the autonomous system and are advertised by Type 5 LSAs. In this case cost is always the external cost only. This is the default OSPF external route type on Cisco routers.
Hellos are sent every 5 seconds on broadcast links - as well as p2p serial - p2p subinterface - and multipoint circuits greater than T1.
OSPF addresses packets to multicast address 224.0.0.6.
30. What is the meaning of the following regular expression: _200$
The default value of the MED attribute is 0.
A list of networks known by BGP - along with their paths and attributes. To view it - use the show ip bgp command.
These routes are Type-1 external routes. They define networks outside of the autonomous system and are advertised by Type 5 LSAs. The cost is calculated by adding the external cost to the internal cost of each link that the packet crosses. The use of
This regular expression matches routes that originated in autonomous system 200.
31. If you want to modify parameters before inserting prefixes into the BGP table - you can use a route map. Name at least three reasons why this might be accomplished.
String matching ranges and wildcards - brackets '[]' can be used for ranges - and the '.' can match any single character.
BGP is a path-vector protocol
To qualify as a feasible successor - a next hop router must have an AD less than the FD of the current successor route. More than one feasible successor can exist.
Changing the weight of a locally sourced route - Tagging source routes with BGP communities - Setting the local preference - Changing the value of the MED
32. For the Broadcast Cisco mode of operation - fill in the following information: Dynamic or manual neighbor configuration? ________ - DR/BDR election required? ________
The Network Summary (Type 3) LSA is sent into an area to advertise destinations outside the area. These LSAs are originated by Area Border Routers (ABRs). They flood throughout the autonomous system.
OSPF uses IP protocol number 89.
For the Broadcast Cisco mode of operation: Dynamic or manual neighbor configuration? Dynamic - DR/BDR election required? DR/BDR election
This network is currently unavailable and installation cannot occur in the routing table. The router is currently searching for a replacement route.
33. You have a serial point-to-point connection in your OSPF-enabled WAN environment. Is there a DR/BDR election process in this environment by default?
The AD is the cost between that next hop router and the destination.
The NSSA External (Type 7) LSA is almost identical to a Type 5 AS External LSA - yet it is used to create Not-So-Stubby Areas. An NSSA ASBR generates this LSA - and an NSSA ABR translates it into a Type 5 LSA - which gets propagated into the OSPF dom
Origin - AS-Path - Next-Hop
No DR/BDR election exists in a point-to-point environment by default.
34. You need to advertise a default route into an area regardless of whether or not a default route exists on the router. What command do you use to configure this?
For an OSPF router to advertise a default route into an area - the command default-information originate must be used. If the advertising router does not possess a default route in its routing table - you can use the always keyword to still generate
A site with two connections to multiple ISPs. This gives the most redundancy. BGP is used with the ISPs and can be used internally also.
Three different administrative distance values are possible for OSPF[md]intra-area routes - inter-area routes - and external routes. By default all are set to 110.
The default LSA aging timer is 30 minutes.
35. What does a Type 2 LSA describe - what router produces it - and Where is it flooded?
Packets that require acknowledgement are as follows: Update - Query - Reply
The Network LSA (Type 2) lists all attached routers. These LSAs are produced by the DR on every multi-access network. They are flooded within the originating area.
Three different administrative distance values are possible for OSPF[md]intra-area routes - inter-area routes - and external routes. By default all are set to 110.
BGP speakers
36. How does EIGRP deal with a router that is slow in responding to reliable packets with acknowledgements?
The default cost of the default route is 1.
The next step in the update process features the DR acknowledging the LSU and flooding it to all OSPF speakers using multicast 224.0.0.5.
The router passes the community information on unchanged.
Slow neighbors are sent unicast packets in an attempt to resolve issues with slow neighbors.
37. How many instances of BGP can be run on a single router?
These route types are OSPF inter-area routes. They define networks outside of the area of the router - but within the autonomous system. Type 3 LSAs are used to advertise these route types.
To ensure that the router ID can be pinged - be sure to advertise the address using the appropriate network command.
Only one instance of BGP can be run on a single router
A transit AS is an AS through which traffic to another AS travels - such as with an ISP.
38. How often are Hello packets sent on a point-to-point subinterface in an EIGRP environment?
On-demand circuit is an enhancement that allows efficient operations over dialup - ISDN - and other on-demand circuits.
To ensure that the router ID can be pinged - be sure to advertise the address using the appropriate network command.
Hellos are sent every 5 seconds on broadcast links - as well as p2p serial - p2p subinterface - and multipoint circuits greater than T1.
External BGP is a BGP peering relationship between routers in different autonomous systems.
39. Describe an autonomous system(AS).
Lowest cost route calculated by adding the cost between the next hop router and the destination (AD) and the cost between the local router and the next hop. This sum is referred to as the FD.
EIGRP stub routing is a feature that allows you to specify the routes that are propagated from the spoke.
An autonomous system is a group of networks under a common administration. The Internet Assigned Numbers Authority(IANA) assigns AS numbers: 1 to 64511 are public AS numbers and 64512 to 65535 are private AS numbers.
This regular expression matches routes that originated in autonomous system 200.
40. You are examining the results of the show ip route command - and you notice several OSPF routes bear an O route designator. What does this signify?
The O indicates the route is an OSPF intra-area route. The network destination is within the same area as the router on which this command is issued.
The only LSA flooded into the area is a single Type 3 default LSA.
A Priority value of 0 is configured on all routers.
Router(config-router)# area area-id default-cost cost
41. What is the feasible successor in EIGRP?
The command is applied on all routers in the area.
Link flapping - Network type being broadcast - PPP host route being redistributed - One router being not demand-circuit capable
The next hop router for a backup path is called the feasible successor.
Using the default-metric command in BGP configuration mode causes all redistributed networks to have the specified MED value.
42. You can reduce the flooding of LSAs in a stable network topology with what command?
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43. How can you temporarily disable a BGP neighborship?
The Database Description (DBD) packet type checks for database synchronization between routers.
The correct command is show ip bgp.
20
Router(config-router)# neighbor ip-address shutdown
44. What is the Feasible Distance (FD) value in EIGRP?
Lowest cost route calculated by adding the cost between the next hop router and the destination (AD) and the cost between the local router and the next hop. This sum is referred to as the FD.
Slow neighbors are sent unicast packets in an attempt to resolve issues with slow neighbors.
Router(config-router)# neighbor ip-address send-community
Hellos are sent every 5 seconds on broadcast links - as well as p2p serial - p2p subinterface - and multipoint circuits greater than T1.
45. Why might an OSPF neighbor be stuck in the 2-WAY state?
The next route selection criteria is for the router to prefer the highest weight (local to router).
Exterior Gateway Protocol(EGP). BGP v4 is the only EGP currently in use.
Cisco routers prefer a higher weight value.
A Priority value of 0 is configured on all routers.
46. You need to send a route refresh message to a specific BGP-speaking neighbor. What is the correct command syntax to do so?
OSPF addresses packets to multicast address 224.0.0.5.
The next hop router for a backup path is called the feasible successor.
Router# clear ip bgp ip-address in
BGP peers
47. What is the command to change the cost of the default route used within a Totally Stubby area?
These route types are OSPF inter-area routes. They define networks outside of the area of the router - but within the autonomous system. Type 3 LSAs are used to advertise these route types.
Use the neighbor [ip address] next-hop-self command in BGP configuration mode.
Router(config-router)# area area-id default-cost cost
DROTHERs form an adjacency with the DR and BDR.
48. What does a router do if that router does not support BGP communities and a route update appears with community information?
BGP peer groups would be ideal for this situation.
The Database Description (DBD) packet type checks for database synchronization between routers.
The router passes the community information on unchanged.
10 seconds is the default Hello interval and the default Dead interval is 4 times that value.
49. Identify the command that can be used to manually configure a neighbor in a NBMA OSPF environment.
Multiply the IGRP metric by 256.
The neighbor command can be used to manually configure a neighbor in a NBMA OSPF environment. The full syntax of the command is: - Router(config-router)# neighbor ip-address [priority number] [poll-interval seconds] [cost number] [database-filter all
The Network LSA (Type 2) lists all attached routers. These LSAs are produced by the DR on every multi-access network. They are flooded within the originating area.
A site with a single ISP connection.
50. You have configured the demand-circuit configuration in your OSPF network - but the link keeps coming up because of OSPF. Name at least three possible reasons for this.
A transit AS is an AS through which traffic to another AS travels - such as with an ISP.
A list of networks known by BGP - along with their paths and attributes. To view it - use the show ip bgp command.
Link flapping - Network type being broadcast - PPP host route being redistributed - One router being not demand-circuit capable
These are Type-2 external routes. Again - they define networks outside of the autonomous system and are advertised by Type 5 LSAs. In this case cost is always the external cost only. This is the default OSPF external route type on Cisco routers.
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