SPROUTE question of the day
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Refer to the OSPF command exhibit. Which effect does the no-summary command option have?
RP/0/RSP0/CPU0:P1(config-ospf)#area 1 stub no-summary
A. It will cause area 1 to be able to receive non-summarized inter-area routes.
B. It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.
C. It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.
D. It will convert the NSSA area into a NSSA totally stubby area.
E. It will convert the stubby area into a NSSA.
F. It will disable OSPF auto-summary.
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50 Comments sorted by
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When troubleshooting OSPF neighbor errors, which three verification steps should be considered?
A. Verify if neighboring OSPF interfaces are configured in the same area.
B. Verify if neighboring OSPF interfaces are configured with the same OSPF process ID.
C. Verify if neighboring OSPF interfaces are configured with the same OSPF priority.
D. Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.
E. Verify if neighboring OSPF interfaces are configured with the same area type.
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On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?
A. interface gi0/0/0/1
ip address 10.1.1.1 255.255.255.0
!
router ospf 1
network 10.1.1.1 0.0.0.0 area 0
B. interface gi0/0/0/1
ip address 10.1.1.1 255.255.255.0
!
router ospf 1
network 10.1.1.1 255.255.255.255 area 0
C. router ospf 1
area 0
interface GigabitEthernet0/0/0/1
D. interface gi0/0/0/1
ip address 10.1.1.1 255.255.255.0
ip ospf 1 area 0
E. router ospf 1
address-family ipv4 unicast
interface GigabitEthernet0/0/0/1 area 0
F. router ospf 1
address-family ipv4 unicast
interface GigabitEthernet0/0/0/1
area 0
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Which three statements are true regarding the OSPF router ID?
A. The OSPF routing process chooses a router ID for itself when it starts up.
B. The router-id command is the preferred procedure to set the router ID.
C. If a loopback interface is configured, its address will always be preferred as the router ID over any other methods.
D. After the router ID is set, it does not change, even if the interface that the router is using for the router ID goes down. The router ID changes only if the router reloads or if the OSPF routing process restarts.
E. In OSPF version 3, the OSPF router ID uses a 128-bit number.
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Which two OSPF network scenarios require OSPF virtual link configuration?
A. to connect an OSPF non-backbone area to area 0 through another non-backbone area.
B. to connect an NSSA area to an external routing domain.
C. to connect two parts of a partitioned backbone area through a non-backbone area.
D. to enable route leaking from Level 2 into Level 1.
E. to enable route leaking from Level 1 into Level 2.
F. to enable OSPF traffic engineering.
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What is function of the RP/0/RSP0/CPU0:PE1(config-ospf)#distance Cisco IOS-XR command?
A. To modify the administrative distance of the OSPF routes
B. To modify the default seed metric of the OSPF external routes
C. To modify the OSPF default reference bandwidth
D. To modify the OSPF cost
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Which four statements are correct regarding IS-IS operations?
A. By default, Level 1 routers within an IS-IS area do not carry any routing information external to the area to which they belong. They use a default route to exit the area.
B. Summarization should be configured on the Level 2 routers, which injects the Level 2 routes into Level 1.
C. IS-IS supports "route leaking" in which selected Level 2 routes can be advertised by a Level 1/Level 2 router into Level 1.
D. The IS-IS backbone is a contiguous collection of Level 1 capable routers, each of which can be in a different area.
E. With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas.
F. Cisco IOS XR Software supports multitopology for IPv6 IS-IS unless single topology is explicitly configured in IPv6 address-family configuration mode.
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When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct?
A. By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.
B. By default, the IS-IS router type is Level 1 and Level 2.
C. All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance ID.
D. By default, metric-style narrow is used.
E. By default, the IS-IS interface circuit type is Level 1 and Level 2.
F. The area IS-IS address-family configuration command is used to specify the IS-IS area address.
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Refer to the PE1 router routing table output exhibit. What is causing the i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 entry on the PE1 router routing table?
RP/0/RSP0/CPU0:PE1#show route ipv4 isis
<output omitted>
i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0
i L1 10.1.10.1/32 [115/30] via 192.168.101.11, 00:42:39, GigabitEthernet0/0/0/0
i L1 10.1.10.2/32 [115/24] via 192.168.112.21, 00:44:40, GigabitEthernet0/0/0/1
i L1 10.1.10.3/32 [115/32] via 192.168.113.22, 00:38:23, GigabitEthernet0/0/0/2
i L1 10.1.10.4/32 [115/22] via 192.168.114.23, 00:14:10, GigabitEthernet0/0/0/3
<output omitted>
A. The PE1 router is receiving the 10.1.10.0/24 summary route from the upstream L1/L2 IS-IS router.
B. The PE1 router has been configured to summarize the 10.1.10.x/32 IS-IS routes to 10.1.10.0/24.
C. The 10.1.10.0/24 has been suppressed because IS-IS auto-summary has been disabled on the PE1 router.
D. The 10.1.10.0/24 has been suppressed because of a route policy configuration on the PE1 router.
E. The 10.1.10.0/24 has been suppressed because the more specific 10.1.10.x/32 IS-IS routes have been configured to leak into the IS-IS non-backbone area.
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Refer to the Cisco IOS XE IS-IS configuration exhibit. What are two problems with the configuration that are causing the IPv4, or the IPv6, or the IPv4 and IPv6 IS-IS operations to fail?
interface GigabitEthernet0/0/0
ip address 192.168.104.40 255.255.255.0
ip router isis
ipv6 address 2001:DB8:192:168:104::40/80
ipv6 enable
ipv6 router isis
!
interface GigabitEthernet0/0/1
ip address 192.168.134.40 255.255.255.0
ip router isis
ipv6 address 2001:DB8:192:168:134::40/80
ipv6 enable
ipv6 router isis
!
router isis 1
net 49.0004.0100.0400.1001.00
summary-address 10.4.10.0 255.255.255.0
!
A. The configuration is missing the interface gi0/0/0 and interface gi0/0/1 commands under router isis 1.
B. The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router isis 1.
C. IPv6 unicast routing has not been enabled globally on the Cisco IOS XE router.
D. The gi0/0/0 and gi0/0/1 interfaces are not participating in the router isis 1 routing instance.
E. Multitopology IS-IS must be enabled to support both IPv4 and IPv6.
F. Another router isis instance must be enabled to support IPv6.
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In which network environment is IS-IS adjacency check important?
A. in a multitopology environment where there are different instances of IS-IS running on the same router
B. in an IPv4/IPv6 environment and running single-topology IS-IS
C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router
D. when IS-IS neighbors are in an NBMA environment like over Frame Relay
E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN
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Refer to the IS-IS configuration exhibit. This is the typical IS-IS configuration of the routers in an AS using IS-IS as the IGP. This AS is in the transition phase of integrating IPv6 into the network. During this transition phase, some of the routers within the AS might be running IPv4 only, some might be running IPv6 only, and others might be running both IPv4 and IPv6. To avoid any black holes for the IPv6 traffic, which configuration change can be made?
router isis 1
net 49.0001.0100.0100.1001.00
address-family ipv4 unicast
!
address-family ipv6 unicast
single-topology
!
interface gi0/0/0/0
address-family ipv4 unicast
!
address-family ipv6 unicast
A. Disable IS-IS adjacency checks.
B. Enable IPv6 adjacency over IPv4 IS-IS peering.
C. Enable multi-topology IS-IS.
D. Disable the IPv4 unicast address-family.
E. Enable IS-IS wide metric to support the single-topology mode.
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What are two purpose of the BGP scan-time command?
A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
B. to allow faster detection of downed BGP peers
C. to improve BGP convergence time
D. to tune the BGP update interval
E. to decrease the effects of unstable routes by increasing the route suppression time
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When using the show bgp ipv6 unicast summary command to verify the IPv6 BGP session status with the IPv6 BGP peers, you noticed the "St/PfxRcd" status for one of the IPv6 BGP peers is in the "Active" state. What does the "Active" state indicate?
A. The IPv6 BGP session has been established with the IPv6 BGP peer.
B. The router is in the process of sending BGP routing updates to the IPv6 BGP peer.
C. The router is in the process of establishing the IPv6 BGP session with the IPv6 BGP peer.
D. The router is exchanging BGP notification messages with its IPv6 BGP peer.
-
Which AS path access list is used by a multihomed customer to only announce their own address space to their service providers to prevent the multihomed customer from becoming a transit AS?
A. ip as-path access-list permit local-as
ip as-path access-list deny *
B. ip as-path access-list deny.*
ip as-path access-list permit *
C. ip as-path access-list permit^$
D. ip as-path access-list permit.*
E. ip as-path access-list permit _^
F. ip as-path access-list permit _$
-
What is recursive lookup in BGP and how does it work?
A. The router looks up the route and the next hop to reach a destination in the remote AS using the IGP. Then the router looks up the route to reach the next hop using BGP.
B. The router looks up the BGP route and the BGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the BGP next hop using the IGP.
C. The router perform three routing lookups to determine the route to reach a destination in the remote AS. The first lookup is done using EBGP, the second lookup is done using IBGP, and the third lookup is done using the IGP.
D. The router looks up the EBGP route and the EBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the EBGP next hop using the IBGP.
E. The router looks up the IBGP route and the IBGP next hop to reach a destination in the remote AS. Then the router looks up the route to reach the IBGP next hop using the EBGP.
-
Which of the following is a characteristic of dual-multihomed connectivity between an enterprise network and the service provider network or networks?
A. An enterprise network announces a default route to each service provider.
B. Each service provider announces a default route on each of the links that connect to the customer with a different metric.
C. An enterprise network that is connected to two or more different service providers with two or more links per service provider and using BGP to exchange routing updates with the service providers.
D. Load balancing can be achieved using the maximum-paths command.
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What are two ways to advertise networks into BGP?
A. using the network router BGP command
B. using route redistribution into BGP
C. using the neighbor router BGP command
D. enabling an interface to run BGP using the interface router BGP command
E. using a route policy in Cisco IOS XR Software or using a route map in Cisco IOS Software or Cisco IOS XE Software
-
What are two characteristics of the multihomed customers to service providers connection option?
A. Multihomed customer must use a provider-assigned address space.
B. The traffic load can be shared for different destination networks between service providers.
C. Multihomed customers must receive a full routing table from the service providers.
D. The routing methodology must be capable of reacting to dynamic changes. BGP is used to achieve this flexibility.
E. Multihomed customers must use a private AS number.
-
Referring to the partial Cisco IOS-XR BGP configuration exhibit.
router bgp 65111
!
neighbor 10.1.1.1
remote-as 65111
update-source Loopback0
address-family ipv4 unicast
!
!
neighbor 2001:db8:10:1:1::1
remote-as 65111
update-source Loopback0
address-family ipv6 unicast
!
When trying to commit this configuration, the following error is displayed:
% Failed to commit one or more configuration items during a pseudo-atomic operation. All changes made have been reverted. Please issue 'show configuration failed' from this session to view the errors.
What is wrong with the configuration?
A. The update-source loopback 0 commands must be configured under the respective neighbor address-family.
B. The configuration is missing the required network command.
C. IPv6 unicast routing has not been enabled globally using the ipv6 unicast-routing command.
D. The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router bgp 65111.
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Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature?
A. IP multicast routes are not supported.
B. Outbound route filtering is configured only on a per-address family basis.
C. The outbound route filter can be defined in a Prefix list, Distribute list or Access lists.
D. Outbound route filtering can be configured for either iBGP or eBGP sessions.
E. Outbound route filtering is more effective when a distance vector IGP is used.
-
Refer to the Cisco IOS-XR route policy exhibit.
route-policy setcomm
if community matches-any (11:11, 44:44) then
set community (55:55) additive
elseif community matches-any (22:22) then
set community (77:77) additive
endif
Which statement correctly describes this route policy?
A. If a route has both the 11:11 and 22:22 communities (or 44:44 and 22:22), the router adds the 55:55 community only.
B. The pass action is required after each of the set community statements to make this route policy functional.
C. If a route only has the 22:22 community, then no community will be added by the router.
D. If a route only has the 11:11 or 44:44 community, then no community will be added by the router.
E. If a route contains the 11:11 or 44:44 community, the router adds the 55:55 community and continues. Additionally, if the same route also contains the 22:22 community, the router also adds another 77:77 community to the same route.
-
Refer to the BGP and route map configurations exhibit.
router bgp 65001
neighbor 10.1.1.2 remote-as 65023
neighbor 10.1.1.2 route-map setas out
!
route-map setas permit 10
match ip address test1
set as-path prepend 65111 65112
!
route-map setas permit 20
match ip address test2
set as-path prepend 65202 65203 65204
!
!end of the route-map configuration
When the "setas" route map is applied to the 10.1.1.2 neighbor, the 10.1.1.2 neighbor is not able to receive all the required BGP routes from this router. What could be the problem?
A. The test1 or test2 prefix-list is misconfigured.
B. The BGP session was cleared using the clear ip bgp command after the route map was applied.
C. The route map is missing the route-map setas permit 30 statement.
D. There is no pass action configured within the route map.
-
In Cisco IOS and Cisco IOS XE Software images, when redistributing routes from other routing protocols into OSPF, what is a common reason why some of the routes might not be redistributed into OSPF?
A. The OSPF seed metric is not defined.
B. The subnets option in the redistribute command is missing.
C. The OSPF level (Level 1, Level 2, or Level-1-2) to which the routes will be redistributed into is not defined.
D. The OSPF external metric type (E1 or E2) is not defined.
-
Refer to the exhibit.
route-policy OSPFintoISIS
if tag eq xxx then
drop
else
set tag yyy
endif
end-policy
Based on the Cisco IOS XR route policy configuration, when redistributing OSPF routes into IS-IS, to which of the following does the "tag" value correspond?
A. The tag value represents the OSPF metric.
B. The tag value represents the administrative distance
C. The tag value identifies a route or set of routes.
D. The tag value is used to match whether the IS-IS route is an external or internal IS-IS route.
E. The tag value represents the IS-IS metric.
-
Refer to the Cisco IOS route map configuration exhibit.
route-map test permit 10
match ip address prefix-list PL1 PL2
match as-path APACL1
set local-preference 200
set metric 1000
!
route-map test permit 100
Which two statements are correct?
A. All routes that are not matched by the sequence 10 route map statement will be dropped.
B. The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.
C. All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path access list.
D. The local preference AND the metric will be set to 1000 IF the route matches the PL1 OR PL2 prefix list AND the route must also match the APACL1 AS path access list.
E. The three match conditions are logical AND: match prefix list PL1 AND PL2 AND match the APACL1 AS path access list.
-
Refer to the route policies exhibit.
route-policy one
end-policy
!
route-policy two
pass
end-policy
!
route-policy three
drop
end-policy
!
route-policy four
set weight 100
end-policy
!
route-policy five
pass
drop
pass
end-policy
Which five route policies will cause the routes to be dropped or passed?
A. route-policy four will cause the routes to be dropped.
B. route-policy five will cause the routes to be dropped.
C. route-policy five will cause the routes to be passed.
D. route-policy three will cause the routes to be dropped.
E. route-policy one will cause the routes to be dropped.
F. route-policy one will cause the routes to be passed.
G. route-policy two will cause the routes to be dropped.
H. route-policy two will cause the routes to be passed.
I. route-policy four will cause the routes to be passed.
J. route-policy three will cause the routes to be passed.
-
Refer to the Cisco IOS XR route policy exhibit.
route-policy SetLP
if med eq 10 then
set local-preference 200
endif
if local-preference eq 100 then
set weight 100
endif
if local-preference eq 200 then
set weight 200
endif
end-policy
If the original incoming routing update has a MED of 10 and a local preference of 100, how will the routing update be modified?
A. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 200.
B. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 100.
C. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 100.
D. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 200.
-
Refer to the topology diagram in the exhibit. Which IS-IS feature could be implemented so that the return path for the packets from router Y in area 49.00AA to router X in area 49.00BB will use the more optimal path?
A. Change the area 49.00AA type from a stub area to a regular area.
B. Enable route leaking to pass Level 2 information into the Level 1 routers.
C. Change the IS-IS administrative distance on router Y in area 49.00AA.
D. Change the IS-IS metric type from narrow to wide on all IS-IS routers.
-
Refer to the exhibit.
Which two configuration options can be used to optimize the IS-IS network scenario?
A. Change the R1 and R2 IS type to Level 2.
B. Change the Gi0/0 interface IS-IS circuit type on R1 and R2 to Level 2 only.
C. Change the IS-IS network type for all the routers to point-to-point.
D. Change the R1 and R2 IS type to Level 1.
E. Change the IS type for all the routers to Level-1-2.
F. Change the Gi0/1 interface IS-IS circuit type on R1 and R2 to Level 1.
-
Refer to the network diagram in the exhibit.
Assuming the IBGP session within AS 64500 was established using the loopback 0 interface between the two routers, by default, what will be the next hop of the routes from AS 64501 when the routes appear on the router running IBGP only in AS 64500?
A. 10.1.10.1
B. 10.0.1.1
C. 192.168.101.10
D. 10.1.1.1
E. 192.168.101.11
-
How can you prevent multihomed customers with connections to two service providers from acting as a transit AS?
A. Use MED to influence the inbound traffic from the ISPs.
B. Use conditional advertisements when sending BGP updates to the ISPs.
C. Enable BGP synchronization on all the customer routers.
D. Use static routing to the ISPs.
E. Use an AS-path access-list to filter the BGP updates to the ISPs.
-
Refer to the Cisco IOS XR route policy exhibit.
route-policy new
if community matches-any test then
set local-preference 10
elseif community matches-every foo then
set local-preference 20
else
pass
endif
end-policy
Which two statement are correct?
A. The "match-any" option indicates matching either the standard community or extended community.
B. "test" and "foo" are references to the community sets.
C. Routes that match both the "test" and "foo" conditions will have their local preference set to 20.
D. All non-matching routes will be permitted.
-
When redistributing routes into OSPF, which kind of routes will be redistributed by default on Cisco IOS XR Software but will not be automatically redistributed by default on Cisco IOS Software and Cisco IOS XE Software?
A. subnetted routes
B. /32 host routes
C. Type 1 external routes
D. tagged static routes
E. Type 2 external routes
-
Refer to the exhibit. Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?
router ospf 100
bfd minimum-interval 2
bfd multiplier 20
area 0
interface GigabitEthernet0/3/0/1
interface GigabitEthernet0/3/0/2
end
A. bfd fast-detect also needs to be enabled for the OSPF area under area 0.
RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect
B. bfd fast-detect also needs to be enabled globally on the router.
RP/0/RSP0/CPU0:P1(config)#bfd fast-detect
C. bfd fast-detect also needs to be enabled globally under router ospf 100.
RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect
D. bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface gi0/3/0/1.
RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect
E. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1.
RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect
-
Refer to the Cisco IOS show command output shown in the exhibit.
R1# show ip bgp 10.2.10.1
BGP routing table entry for 10.2.10.1/32, version 32
Paths: (2 available, best #2, table default)
Advertised to update-groups:
2
64500 64500 64502
192.168.103.30 from 192.168.103.30 (10.3.1.1)
Origin IGP, localpref 100, weight 100, valid, external
64500 64500 64502
192.168.134.40 (metric 11) from 192.168.134.40 (10.4.1.1)
Origin IGP, localpref 100, weight 200, valid, external, best
R1# show ip bgp
BGP table version is 89, local router ID is 11.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.2.10.1/32 192.168.201.20 200 64500 64500 64500 64500 64502 i
192.168.101.10 100 64500 64500 64502 i
Which of the following statement is correct?
A. The best path to 10.2.10.1/32 was chosen because of the route origin.
B. The best path to 10.2.10.1/32 was chosen because of the weight.
C. The best path to 10.2.10.1/32 was chosen because of the AS path.
D. The best path to 10.2.10.1/32 was chosen because of the local preference.
E. The best path to 10.2.10.1/32 was chosen because of the MED.
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