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Q371. Refer to the exhibit.
A PE router is configured with a policy map that contains the policer shown. The policy map is configured in the inbound direction of an interface facing a CE router. If the PE router
receives 12Mb/s of traffic with the CoS value set to 7 on a 100-Mb/s interface from the CE router, what value of MPLS EXP is set when this traffic goes through the policer shown?
A. 0
B. 6
C. 7
D. 8
Answer: B
Explanation:
Here, the policer is set where the conforming traffic is set to 10 percent of the 100 Mbps interface, so anything more than 10 Mbps will be placed into the exceeding traffic class, the traffic EXP value will be changed from 7 to 6 per the configuration.
Q372. Which action does route poisoning take that serves as a loop-prevention method?
A. It immediately sends routing updates with an unreachable metric to all devices.
B. It immediately sends routing updates with a metric of 255 to all devices.
C. It prohibits a router from advertising back onto the interface from which it was learned.
D. It advertises a route with an unreachable metric back onto the interface from which it was learned.
E. It poisons the route by tagging it uniquely within the network.
Answer: A
Explanation:
With route poisoning, when a router detects that one of its connected routes has failed, the router will poison the route by assigning an infinite metric to it and advertising it to neighbors.
Q373. Refer to the exhibit.
What will be the extended community value of this route?
A. RT:200:3000 RT:200:9999
B. RT:200:9999 RT:200:3000
C. RT:200:3000
D. RT:200:9999
Answer: D
Explanation:
Here the route map is being used to manually set the extended community RT to 200:9999
Q374. You are implementing new addressing with EIGRP routing and must use secondary addresses, which are missing from the routing table. Which action is the most efficient solution to the problem?
A. Disable split-horizon on the interfaces with secondary addresses.
B. Disable split-horizon inside the EIGRP process on the router with the secondary interface addresses.
C. Add additional router interfaces and move the secondary addresses to the new interfaces.
D. Use a different routing protocol and redistribute the routes between EIGRP and the new protocol.
Answer: A
Explanation:
Normally, routers that are connected to broadcast-type IP networks and that use distance-vector routing protocols employ the split horizon mechanism to reduce the possibility of routing loops. Split horizon blocks information about routes from being advertised by a router out of any interface from which that information originated. This behavior usually optimizes communications among multiple routers, particularly when links are broken. However, with nonbroadcast networks, situations can arise for which this behavior is less than ideal. For these situations, you might want to disable split horizon with EIGRP and RIP. If an interface is configured with secondary IP addresses and split horizon is enabled, updates might not be sourced by every secondary address. One routing update is sourced per network number unless split horizon is disabled.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfrip.html
Q375. What does a nonzero forwarding address indicate in a type-5 LSA?
A. It indicates that this link-state ID is eligible for ECMP.
B. It indicates that this router should have an OSPF neighbor relationship with the forwarding address before using this link-state ID.
C. It indicates that the receiving router must check that the next hop is reachable in its routing table before using this link-state ID.
D. It indicates that traffic can be directly routed to this next hop in shared segment scenarios where the external route source is directly connected.
Answer: D
Explanation:
The value of the forwarding address specified by the autonomous system boundary router (ASBR) can be either 0.0.0.0 or non-zero. The 0.0.0.0 address indicates that the originating router (the ASBR) is the next hop. The forwarding address is determined by these conditions:
. The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes.
. These conditions set the forwarding address field to a non-zero address: ASBR's next hop interface address falls under the network range specified in the router ospf command.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-10.html
Far out 400-101 actual exam:
Q376. Where is multicast traffic sent, when it is originated from a spoke site in a DMVPN phase 2 cloud?
A. spoke-spoke
B. nowhere, because multicast does not work over DMVPN
C. spoke-spoke and spoke-hub
D. spoke-hub
Answer: D
Explanation:
Spokes map multicasts to the static NBMA IP address of the hub, but hub maps multicast packets to the “dynamic” mappings – that is, the hub replicates multicast packets to all spokes registered via NHRP, so multicast traffic is sent to the hub from a spoke instead of to the other spokes directly.
Q377. Refer to the exhibit.
Router A and router B are physically connected over an Ethernet interface, and IS-IS is configured as shown. Which option explains why the IS-IS neighborship is not getting formed between router A and router B?
A. same area ID
B. same N selector
C. same domain ID
D. same system ID
Answer: D
Explanation:
With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique. The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide.
Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml
Q378. Refer to the exhibit.
R1 is able to reach only some of the subnets that R2 is advertising. Which two configuration changes can you make to ensure that R1 can reach all routes from R2? (Choose two.)
A. Add an additional permit statement to the LOOPBACKS route map.
B. Modify the LOOPBACKS access list to include all loopback subnets.
C. Add an additional statement in the LOOPBACKS route map to match both Level 1 and Level 2 circuits.
D. Add an additional statement in the LOOPBACKS route map to match the R1 CLNS address.
E. Configure the interfaces between R1 and R2 with a Level 1 IS-IS circuit.
F. Configure the interfaces between R1 and R2 with a Level 2 IS-IS circuit.
Answer: A,B
Explanation:
In this example, the access list is using a 0.0.3.255 wildcard mask, so only the loopback IP’s of 172.16.0.0 – 172.16.3.255 will be included. We need to add another statement to allow loopback 4 to be advertised, or modify the wildcard mask to include them all.
Q379. Which IP SLA operation type uses IP to measure the round-trip time between a router and a device?
A. HTTP
B. ICMP Echo
C. ICMP Path Jitter
D. UDP Jitter for VoIP
Answer: B
Q380. DRAG DROP
Drag and drop the Cisco IOX XE subpackage on the left to the function it performs on the right.
Answer: