Cisco 642-883 exam certification is the dream of all of the IT aspirants. Should you be a work hunter who are furthermore eager to obtain your Cisco Cisco certificate. Please participate in Actualtestss online course. Youll get a high mark which guarantee the wonderful success.
2021 Dec 642-883 free practice questions
Q51. Refer to the show command output in the exhibit.
For which reason will this router drop all traffic that is destined to the 1.1.1.0/24 network?
A. The 1.1.1.0/24 route is not synchronized.
B. The BGP next hop for reaching the 1.1.1.0/24 network is not reachable.
C. The metric of the 1.1.1.0/24 route is set to 0.
D. The weight of the 1.1.1.0/24 route is set to 0.
E. The 1.1.1.0/24 route is an incomplete route.
F. The IBGP split-horizon rule is preventing the router to use the IBGP route.
Answer: B
Q52. Which four statements are correct regarding IS-IS operations? (Choose four.)
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.
Answer: A,C,E,F
Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3isis.h tml#wp1148617
Single-Topology IPv6 Support
Single-topology IPv6 support on Cisco IOS XR software allows IS-IS for IPv6 to be configured on interfaces along with an IPv4 network protocol. All interfaces must be configured with the identical set of network protocols and all routers in the IS-IS area (for Level 1 routing) or the domain (for Level 2 routing) must support the identical set of network layer protocols on all interfaces.
When single-topology support for IPv6 is used, only narrow link metrics, also known as old-style type, length, value (TLV) arguments, may be employed. During single-topology operation, one shortest path first (SPF) computation per level is used to compute both IPv4 and IPv6 routes. Using a single SPF is possible because both IPv4 IS-IS and IPv6 IS-IS routing protocols share a common link topology. Because multitopology is the default behavior in the software, you must explicitly configure IPv6 to use the same topology as IPv4 in order to enable single-topology IPv6. Configure the single-topology command in ipv6 address family configuration submode of the IS-IS router stanza.
Multitopology IPv6 Support
Multitopology IPv6 support on Cisco IOS XR software differs from Cisco IOS software in that IS-IS assumes that multitopology support is required as soon as it detects interfaces configured for both IPv6 and IPv4 within the IS-IS stanza. You must use the metric-style wide command to configure IS-IS to wide link metrics as multitopology link advertisements.
Q53. 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 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.
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 announces a default route to each service provider.
D. Load balancing can be achieved using the maximum-paths command.
Answer: A
Q54. A service provider is running BGP with clients at the edge of the network. The service provider sees that routing updates from one site are being dropped when the other site receives them. Which feature.fixes this issue?
A. EBGP multihop
B. inter-AS peering
C. AS-override
D. allow-AS in
Answer: C
Q55. In comparing IS-IS with OSPF, a Level-1-2 IS-IS router is similar to which kind of OSPF router?
A. ASBR on a normal OSPF area
B. ASBR on NSSA
C. ABR on totally stubby OSPF area
D. ABR on stubby OSPF area
E. ABR on a normal OSPF area
Answer: C
Latest 642-883 practice:
Q56. Refer to the network diagram in the exhibit.
If both ASBRs are advertising the external Destination X network as OSPF E2 route, what is the best path for the R1 router to reach Network X?
A. R1 will use the path via ASBR 2 as the best path.
B. R1 will use the path via ASBR 1 as the best path.
C. R1 will load balance between two equal cost paths via ASBR 1 and ASBR 2.
D. R1 will sees two equal costs and will choose the path through the ASBR with the lower OSPF router ID.
Answer: B
Q57. Which three potential issues can cause an OSPF adjacency to not come up? (Choose three.)
A. wrong area configured on OSPF peers
B. wrong authentication key configured on OSPF peers
C. different OSPF instance numbers configured on OSPF peers
D. different OSPF instances and VRFs configured with the command: router ospf <number1> vrf <number2>
E. having the no passive-interface statement configured for the interfaces on which OSPF adjacencies are expected to form
F. Layer 2 connectivity problems on the shared medium of the participating OSPF-enabled routers
Answer: A,B,F
Q58. What is the configured IS-IS circuit-type between the CE5 and PE5 routers and between the PE5 and PE6 routers? (Choose two.)
A. Circuittype L1 between CE5 and PE5 4
B. Circuittype L1/L2 between CE5 and PE5
C. Circuittype L2 between CE5 and PE5
D. Circuittype L1 between PE5 and PE6
E. Circuittype L1/L2 between PE5 and PE6
F. Circuittype L2 between PE5 and PE6
Answer: A,F
Explanation:
#show clns neighbor
Q59. Which series of commands configures area 1 as an OSPF totally stubby area on a Cisco IOS XR router?
A. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 stub no-summary interface GigabitEthernet 0/0/0/2
B. router ospfv3 1 router-id 10.10.10.1 default-information originate area 0 interface GigabitEthernet 0/0/0/1 area 1 stub interface GigabitEthernet 0/0/0/2
C. ipv6 prefix-list default permit ::0/0 router ospfv3 1 router-id 10.10.10.1 default-information originate area 0 interface GigabitEthernet 0/0/0/1 distribute-list prefix-list default in area 1 interface GigabitEthernet 0/0/0/2
D. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 interface GigabitEthernet 0/0/0/2 no-summary passive
E. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 stub interface GigabitEthernet 0/0/0/2 default-cost 20
Answer: A
Q60. Which RPLs can be used to conditionally advertise a default route based on the prefix
1.1.1.1 being in the routing table?
A. route-policy RPL_Default_Originate if rib-has-route in (1.1.1.1/32) pass else drop endif end-policy
B. route-policy RPL_Default_Originate if rib-has-route in (1.1.1.1/32) drop else pass endif end-policy
C. route-policy RPL_Default_Originate if route in (1.1.1.1/32) pass else drop endif end-policy
D. route-policy RPL_Default_Originate if not rib-has-route in (1.1.1.1/32) pass else drop endif end-policy
Answer: A