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2021 Nov ccie dumps 400-101:
Q21. What is the purpose of Route Target Constraint?
A. to avoid using route reflectors in MPLS VPN networks
B. to avoid using multiple route distinguishers per VPN in MPLS VPN networks
C. to be able to implement VPLS with BGP signaling
D. to avoid sending unnecessary BGP VPNv4 or VPNv6 updates to the PE router
E. to avoid BGP having to perform route refreshes
Answer: D
Explanation:
Some service providers have a very large number of routing updates being sent from RRs to PEs, using considerable resources. A PE does not need routing updates for VRFs that are not on the PE; therefore, the PE determines that many routing updates it receives are “unwanted.” The PE can filter out the unwanted updates using Route Target Constraint.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/iproute_bgp/configuration/guide/2_xe/irg_x e_book/irg_rt_filter_xe.html.
Q22. Refer to the exhibit.
Which configuration can you implement on PE-1 to allow CE-1 to receive delegated IPv6 prefixes?
A)
B)
C)
D)
E)
A. Exhibit A
B. Exhibit B
C. Exhibit C
D. Exhibit D
E. Exhibit E
Answer: A
Q23. Which technology can MSDP SA filters use to filter traffic?
A. route maps
B. community lists
C. prefix lists
D. class maps
Answer: A
Q24. Which two statements are true about an EVPL? (Choose two.)
A. It has a high degree of transparency.
B. It does not allow for service multiplexing.
C. The EVPL service is also referred to as E-line.
D. It is a point-to-point Ethernet connection between a pair of UNIs.
Answer: C,D
Explanation:
Following the MEF approach, the services that comprise the Metro Ethernet (ME) solution can be classified into the following two general categories:
. Point-to-point (PtP) — A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs).
. Multipoint-to-multipoint (MPtMP) — A single multipoint-to-multipoint Ethernet circuit provisioned between two or more UNIs. When there are only two UNIs in the circuit, more UNIs can be added to the same Ethernet virtual connection if required, which distinguishes this from the point-to-point type. In the MEF terminology, this maps to the following Ethernet service types:
. Ethernet Line Service Type (E-Line) — Point-to-point Ethernet service
. Ethernet LAN Service Type (E-LAN) — Multipoint-to-multipoint Ethernet service
Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_C lusters/HA_ME3_6.pdf
Q25. Which two statements about path selection are true? (Choose two.)
A. If there are multiple equal matches between OSPF processes, the path with the lowest OSPF PID is chosen.
B. If the backdoor command is configured on a BGP network, the route is advertised with an AD of 20.
C. If an OSPF E2 route has an AS of 90, that path is preferred over an OSPF IA route with an AD of 110.
D. If there are multiple equal matches between the same protocols on an EIGRP network, the preferred path will be EIGRP with the highest AS.
E. If IS-IS has multiple routes with the same prefix-length, it will prefer Level 1 routes over Level 2 routes.
Answer: A,E
Latest 400-101 ccie dumps free download:
Q26. Which two OSPF LSA types are flooded within the originating area? (Choose two.)
A. type 1, Router LSA
B. type 2, Network LSA
C. type 3, Network Summary LSA
D. type 4, ASBR Summary LSA
E. type 6, Group Membership LSA
F. type 9, Opaque LSA
Answer: A,B
Explanation:
OSPF relies on several types of Link State Advertisements (LSAs) to communicate link state information between neighbors. A brief review of the most applicable LSA types:
. Type 1 - Represents a router
. Type 2 - Represents the pseudonode (designated router) for a multiaccess link
. Type 3 - A network link summary (internal route)
. Type 4 - Represents an ASBR
. Type 5 - A route external to the OSPF domain
. Type 7 - Used in stub areas in place of a type 5 LSA LSA types 1 and 2 are found in all areas, and are never flooded outside of an area. They are only flooded within the area that they originated from.
Reference: http://packetlife.net/blog/2008/jun/24/ospf-area-types/
Q27. Which topology allows the split-horizon rule to be safely disabled when using EIGRP?
A. full mesh
B. partial mesh
C. hub and spoke
D. ring
Answer: C
Q28. Which two statements about IS-IS are true? (Choose two.)
A. The default hello interval is 10 seconds and the default hold timer is 30 seconds.
B. The hello interval can be changed on a per-interface basis with the command isis hello-multiplier.
C. Both routers need to have the same hello intervals and hold timers in order to form IS-IS neighbors.
D. Both IS-IS routers need to have the same capabilities in the hello packet in order to form neighbors.
Answer: A,B
Explanation:
isis hello-interval
To specify the length of time between hello packets that the Cisco IOS software sends, use the isis hello-interval command in interface configuration mode. By default, a value three times the hello interval seconds is advertised as the hold time in the hello packets sent. (Change the multiplier of 3 by specifying the isis hello-multiplier command.) With smaller hello intervals, topological changes are detected faster, but there is more routing traffic. The default is 10 seconds.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfisis.ht ml
Q29. Refer to the exhibit.
A tunnel is configured between R3 to R4 sourced with their loopback interfaces. The ip pim sparse-dense mode command is configured on the tunnel interfaces and multicast-routing is enabled on R3 and R4. The IP backbone is not configured for multicast routing.
The RPF check has failed toward the multicast source.
Which two conditions could have caused the failure? (Choose two.)
A. The route back to the RP is through a different interface than tunnel 0.
B. The backbone devices can only route unicast traffic.
C. The route back to the RP is through the same tunnel interface.
D. A static route that points the RP to GigabitEthernet1/0 is configured.
Answer: A,D
Explanation:
.For a successful RPF verification of multicast traffic flowing over the shared tree (*,G) from RP, an ip mroute rp-address nexthop command needs to be configured for the RP address, that points to the tunnel interface.
A very similar scenario can be found at the reference link below:
Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/43584-mcast-over-gre.html
Q30. DRAG DROP
Drag and drop the EIGRP query condition on the left to the corresponding action taken by the router on the right.
Answer: