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Q191. 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
Q192. Which three statements are true about PPP CHAP authentication? (Choose three.)
A. PPP encapsulation must be enabled globally.
B. The LCP phase must be complete and in closed state.
C. The hostname used by a router for CHAP authentication cannot be changed.
D. PPP encapsulation must be enabled on the interface.
E. The LCP phase must be complete and in open state.
F. By default, the router uses its hostname to identify itself to the peer.
Answer: D,E,F
Explanation:
Point-to-Point Protocol (PPP) authentication issues are one of the most common causes for dialup link failures. This document provides some troubleshooting procedures for PPP authentication issues.
Prerequisites
. Enable PPP encapsulation
. The PPP authentication phase does not begin until the Link Control Protocol (LCP) phase is complete and is in the open state. If debug ppp negotiation does not indicate that LCP is open, troubleshoot this issue before proceeding.
Note. By default, the router uses its hostname to identify itself to the peer. However, this CHAP username can be changed through the ppp chap hostname command.
Reference: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html
Q193. A GRE tunnel is down with the error message %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing error.
Which two options describe possible causes of the error? (Choose two.)
A. Incorrect destination IP addresses are configured on the tunnel.
B. There is link flapping on the tunnel.
C. There is instability in the network due to route flapping.
D. The tunnel mode and tunnel IP address are misconfigured.
E. The tunnel destination is being routed out of the tunnel interface.
Answer: C,E
Explanation:
The %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing error message means that the generic routing encapsulation (GRE) tunnel router has discovered a recursive routing problem. This condition is usually due to one of these causes:
. A misconfiguration that causes the router to try to route to the tunnel destination address using the tunnel interface itself (recursive routing)
. A temporary instability caused by route flapping elsewhere in the network
Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/22327-gre-flap.html
Q194. Which statement about UDLD is true?
A. The udld reset command resets ports that have been error-disabled by both UDLD and Fast UDLD.
B. Fast UDLD is configured in aggressive mode.
C. Only bidirectional link failures can be detected in normal mode.
D. Each switch in a UDLD topology can send and receive packets to and from its neighbors.
Answer: A
Q195. A network engineer wants to add a new switch to an existing switch stack. Which configuration must be added to the new switch before it can be added to the switch stack?
A. No configuration must be added.
B. stack ID
C. IP address
D. VLAN information
E. VTP information
Answer: A
Replace cisco 400-101:
Q196. Refer to the exhibit.
If the route to 10.1.1.1 is removed from the R2 routing table, which server becomes the master NTP server?
A. R2
B. the NTP server at 10.3.3.3
C. the NTP server at 10.4.4.4
D. the NTP server with the lowest stratum number
Answer: D
Explanation:
NTP uses a concept called “stratum” that defines how many NTP hops away a device is from an authoritative time source. For example, a device with stratum 1 is a very accurate device and might have an atomic clock attached to it. Another NTP server that is using this stratum 1 server to sync its own time would be a stratum 2 device because it’s one NTP hop further away from the source. When you configure multiple NTP servers, the client will prefer the NTP server with the lowest stratum value.
Reference: https://networklessons.com/network-services/cisco-network-time-protocol-ntp/
Q197. How does EIGRP derive the metric for manual summary routes?
A. It uses the best composite metric of any component route in the topology table.
B. It uses the worst composite metric of any component route in the topology table.
C. It uses the best metric vectors of all component routes in the topology table.
D. It uses the worst metric vectors of all component routes in the topology table.
Answer: A
Explanation:
For example if your router has a routing table like this:
D 192.168.8.0/24 [90/2632528] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.9.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.10.0/24 [90/2195456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.11.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router):
Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0
After that the routing table of your router will look like this:
D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0
And we can see the manual summary route takes the smallest metric of the specific routes.
Q198. When you implement CoPP on your network, what is its default action?
A. permit all traffic
B. rate-limit bidirectional traffic to the control plane
C. drop management ingress traffic to the control plane
D. monitor ingress and egress traffic to the control plane by using access groups that are applied to the interface
E. block all traffic
Answer: A
Q199. Which two statements about IBGP multipath are true? (Choose two.)
A. The IGP metric of the BGP next hop can be different from the best-path IGP metric if you configure the router for unequal-cost IBGP multipath.
B. The IGP metric of the BGP next hop must be the same as the best-path IGP metric.
C. The equivalent next-hop-self is performed on the best path from among the IBGP multipaths before it is forwarded to external peers.
D. The path should be learned from an external neighbor.
E. The router BGP process must learn the path from a confederation-external or external neighbor.
F. The router BGP process must learn the path from an internal neighbor.
Answer: A,F
Q200. Which attribute is transported over an MPLS VPN as a BGP extended community?
A. route target
B. route distinguisher
C. NLRI
D. origin
E. local preference
Answer: A