Secrets to ccie 400 101

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Q261. Which two improvements do SIA-Query and SIA-Reply messages add to EIGRP? (Choose two.) 

A. Stuck-in-active conditions are solved faster. 

B. They prevent a route from going into the stuck-in-active state. 

C. They help in the localization of the real failure in the network. 

D. The EIGRP adjacency between two neighbors never goes down. 

Answer: A,C 


Q262. Which statement about a P router in a Layer 3 MPLS VPN is true? 

A. It is unaware of VPN routes. 

B. It connects to customer edge routers. 

C. It participates in MPLS VPN routing. 

D. It uses the running IGP to share VPN routes. 

Answer:


Q263. Which two statements about redistribution are true? (Choose two.) 

A. When BGP traffic is redistributed into OSPF, the metric is set to 1 unless the metric is defined. 

B. When EIGRP routes on a CE are redistributed through a PE into BGP, the Cost Community POI is set automatically. 

C. When OSPF traffic is redistributed into BGP, internal and external routes are redistributed. 

D. When BGP traffic is redistributed into OSPF, eBGP and iBGP routes are advertised. 

E. iBGP routes automatically redistribute into the IGP if the routes are in the routing table. 

F. When EIGRP traffic is redistributed into BGP, a default metric is required. 

Answer: A,B 


Q264. In the DiffServ model, which class represents the lowest priority with the highest drop probability? 

A. AF11 

B. AF13 

C. AF41 

D. AF43 

Answer:

Explanation: 

Assured Forwarding (AF) Behavior Group 

Class 1 

Class 2 

Class 3 

Class 4 

Low Drop 

AF11 (DSCP 10) 

AF21 (DSCP 18) 

AF31 (DSCP 26) 

AF41 (DSCP 34) 

Med Drop 

AF12 (DSCP 12) 

AF22 (DSCP 20) 

AF32 (DSCP 28) 

AF42 (DSCP 36) 

High Drop 

AF13 (DSCP 14) 

AF23 (DSCP 22) 

AF33 (DSCP 30) 

AF43 (DSCP 38) 

Reference: http://en.wikipedia.org/wiki/Differentiated_services 


Q265. DRAG DROP 

Drag each statement about EtherChannel protocols on the left to the matching EtherChannel protocol on the right. 

Answer: 


Q266. Which protocol will accept incoming updates when the passive-interface command is configured? 

A. OSPF 

B. IS-IS 

C. RIP 

D. EIGRP 

Answer:


Q267. Which statement is true about IGMP? 

A. Multicast sources send IGMP messages to their first-hop router, which then generates a PIM join message that is then sent to the RP. 

B. Multicast receivers send IGMP messages to their first-hop router, which then forwards the IGMP messages to the RP. 

C. IGMP messages are encapsulated in PIM register messages and sent to the RP. 

D. Multicast receivers send IGMP messages to signal their interest to receive traffic for specific multicast groups. 

Answer:

Explanation: 

In the example shown above, the receivers (the designated multicast group) are interested in receiving the video data stream from the source. The receivers indicate their interest by sending an Internet Group Management Protocol (IGMP) host report to the routers in the network. The routers are then responsible for delivering the data from the source to the receivers. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_o vr.html 


Q268. What is the most efficient way to confirm whether microbursts of traffic are occurring? 

A. Monitor the output traffic rate using the show interface command. 

B. Monitor the output traffic rate using the show controllers command. 

C. Check the CPU utilization of the router. 

D. Sniff the traffic and plot the packet rate over time. 

Answer:

Explanation: 

Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. In order to troubleshoot microbursts, you need a packet sniffer that can capture traffic over a long period of time and allow you to analyze it in the form of a graph which displays the saturation points (packet rate during microbursts versus total available bandwidth). You can eventually trace it to the source causing the bursts (e.g. stock trading applications). 

Reference: Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 989-994). Kindle Edition. 


Q269. What is a reason for an EIGRP router to send an SIA reply to a peer? 

A. to respond to an SIA query with the alternative path requested 

B. to respond to a query reporting that the prefix has gone stuck-in-active 

C. to respond to an SIA query that the router is still waiting on replies from its peers 

D. to respond to a reply reporting that the prefix has gone stuck-in-active 

Answer:


Q270. Which two options are reasons to manipulate the delay metric instead of the bandwidth metric for EIGRP routing? (Choose two.) 

A. Because the delay metric provides better handling for bursty traffic 

B. Because manipulating the bandwidth metric can also affect QoS 

C. Because manipulating the bandwidth affects only a particular path 

D. Because changes to the delay metric are propagated to all neighbors on a segment 

Answer: B,D 

Explanation: 

Using the bandwidth to influence EIGRP paths is discouraged for two reasons: 

. Changing the bandwidth can have impact beyond affecting the EIGRP metrics. For example, quality of service (QoS) also looks at the bandwidth on an interface. 

. EIGRP throttles to use 50 percent of the configured bandwidth. Lowering the bandwidth can cause problems like staving EIGRP neighbors from getting hello packets because of the throttling back. 

Because changes to the delay metric are propagated to all downstream routers, changing the interface delay parameter is the preferred method of influencing path selection 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/13673-14.html 


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