400-101 Guide

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  • Cisco
  • Exam Number/Code 400-101
  • Product Name CCIE Routing and Switching (v5.0)
  • Questions and Answers
  • 911 Q&As
  • Last Updated
  • Jun 18,2018
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Q171. Refer to the exhibit. 

If a connection failure occurs between R1 and R2, which two actions can you take to allow CR-1 to reach the subnet 192.168.192.0/24 on R2? (Choose two.) 

A. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into OSPF. 

B. Turn up a BGP session between CR-1 and R1. 

C. Create a static route on R1 for subnet 192.168.192.0/24 towards R3 and redistribute it into BGP. 

D. Turn up an EIGRP session between R1 and R3 with AS 65535. 

E. Create an OSPF virtual link between CR-1 and R2 to bypass R1. 

Answer: A,B 


Q172. DRAG DROP 

Drag and drop the IS-IS component on the left to the function that it performs on the right. 

Answer: 


Q173. You are tasked with configuring a router on an OSPF domain to import routes from an EIGRP domain and summarize the routes to 192.168.64.0. 

Which statement configures the summarized route and provides equal-path route redundancy? 

A. area 32 range 192.168.64.0 255.255.192.0 cost 100 

B. area 32 range 192.168.64.0 255.255.63.0 cost 100 

C. area 32 range 192.168.64.0 255.255.64.0 cost 100 

D. area 32 range 192.168.64.0 255.255.192.0 multi-path 

Answer:

Explanation: 

area range 

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use the no form of this command. 

Syntax Description 

area-id 

Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address. 

ip-address 

IP address. 

mask 

IP address mask. 

advertise 

(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA). 

not-advertise 

(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks. 

cost cost 

(Optional) Metric or cost for this summary route, which is used during OSPF SPF calculation to determine the shortest paths to the destination. The value can be 0 to 16777215. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html#wp1017596 


Q174. In a network where a Layer 2 switch interconnects several routers, which feature restricts multicast packets for each IP multicast group to only those mulicast router ports that have downstream receivers joined to that group? 

A. PIM snooping 

B. IGMP snooping 

C. IGMP filter 

D. IGMP proxy 

Answer:

Explanation: 

In networks where a Layer 2 switch interconnects several routers, such as an Internet exchange point (IXP), the switch floods IP multicast packets on all multicast router ports by default, even if there are no multicast receivers downstream. With PIM snooping enabled, the switch restricts multicast packets for each IP multicast group to only those multicast router ports that have downstream receivers joined to that group. When you enable PIM snooping, the switch learns which multicast router ports need to receive the multicast traffic within a specific VLAN by listening to the PIM hello messages, PIM join and prune messages, and bidirectional PIM designated forwarder-election messages. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snooppim.html 


Q175. 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. 


Q176. Which bit should be set in the link-state PDU of an IS-IS L1/L2 router to indicate that it is a potential exit point of the area? 

A. the ABR bit 

B. the ATT bit 

C. the down bit 

D. the P bit 

Answer:

Explanation: 

Default routing is achieved in two distinct ways with Integrated IS-IS: 

. Attached bit—Set by a Level 1/Level 2 router in its own Level 1 LSP and used to indicate to all Level 1 routers (within the area) that this router is a potential exit point of the area. Level 1-only routers will default to the nearest attached Level 2 router. 

. Default information originate—Can be configured in Level 1 as well as Level 2. The default route (0.0.0.0/0) is inserted in the router LSP (Level 1 or Level 2, according to the configuration command) and the LSP is flooded according to the router type (Level 1 or Level 2). A Level 2 router doesn't need to have a default route to originate a default route. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml 


Q177. Which object tracking function tracks the combined states of multiple objects? 

A. application 

B. interface 

C. stub-object 

D. list 

Answer:


Q178. What is the maximum number of classes that MQC can support in a single policy map? 

A. 512 

B. 256 

C. 128 

D. 64 

Answer:


Q179. DRAG DROP 

Drag and drop the PPPoE packet type on the left to the corresponding description on the right. 

Answer: 


Q180. 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:


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