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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Q391. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q392. With which ISs will an IS-IS Level 1 IS exchange routing information? 

A. Level 1 ISs 

B. Level 1 ISs in the same area 

C. Level 1 and Level 2 ISs 

D. Level 2 ISs 

Answer:

Explanation: 

IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Level 2 routers are inter area routers that can only form relationships with other Level 2 routers. Routing information is exchanged between Level 1 routers and other Level 1 routers, and Level 2 routers only exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers. 

Reference: http://en.wikipedia.org/wiki/IS-IS 


Q393. Consider a network that mixes link bandwidths from 128 kb/s to 40 Gb/s. Which value should be set for the OSPF reference bandwidth? 

A. Set a value of 128. 

B. Set a value of 40000. 

C. Set a manual OSPF cost on each interface. 

D. Use the default value. 

E. Set a value of 40000000. 

F. Set a value of 65535. 

Answer:

Explanation: 

Unlike the metric in RIP which is determined by hop count and EIGRP’s crazy mathematical formulated metric, OSPF is a little more simple. The default formula to calculate the cost for the OSPF metric is (10^8/BW). By default the metrics reference cost is 100Mbps, so any link that is 100Mbps will have a metric of 1. a T1 interface will have a metric of 64 so in this case if a router is trying to get to a FastEthernet network on a router that is through a T1 the metric would be 65 (64 +1). You do however have the ability to statically specify a metric on a per interface basis by using the ip ospf cost # where the cost is an integer between 1-65535. 

So the big question is why would you want to statically configure a metric? The biggest advantage of statically configuring an OSPF metric on an interface is to manipulate which route will be chosen dynamically via OSPF. In a nut shell it’s like statically configuring a dynamic protocol to use a specific route. It should also be used when the interface bandwidths vary greatly (some very low bandwidth interfaces and some very high speed interfaces on the same router). 


Q394. Which two statements about TCP are true? (Choose two.) 

A. TCP option must be divisible by 32. 

B. It has a 16-bit window size. 

C. Its maximum data offset is fifteen 32-bit words. 

D. It has a 32-bit window size. 

E. Its maximum data offset is ten 32-bit words. 

F. It has a 32-bit checksum field. 

Answer: B,C 


Q395. Refer to the exhibit. 

IPv6 SLAAC clients that are connected to the router are unable to acquire IPv6 addresses. What is the reason for this issue? 

A. Router advertisements are not sent by the router. 

B. Duplicate address detection is disabled but is required on multiaccess networks. 

C. The interface is configured to support DHCPv6 clients only. 

D. The configured interface MTU is too low for IPv6 to be operational. 

Answer:


Q396. Which three improvements does Cisco IOS XE Software offer over traditional IOS Software? (Choose three.) 

A. It can run applications as separate processes on multicore CPUs. 

B. It supports drivers for data plane ASICs outside of the operating system. 

C. It allows platform-dependent code to be compiled into a single image. 

D. It supports multiple IOS instances simultaneously, sharing resources and internal infrastructure for scalability. 

E. It allows platform-independent code to be abstracted into a single microkernel for portability across platforms. 

F. It uses a QNX Neutrino-based environment underneath the IOS Software. 

Answer: A,B,C 


Q397. Refer to the exhibit. 

Which three statements about the device with this configuration are true? (Choose three.) 

A. Multiple AFIs are configured on the device. 

B. The authentication on 172.16.129.7 is configured incorrectly. 

C. The device is configured to support MPLS VPNs. 

D. This device is configured with a single AFI. 

E. The authentication on 172.16.129.4 is configured incorrectly. 

F. The device is configured to support L2VPNs. 

Answer: A,B,C 


Q398. How many bytes comprise the system ID within an IS-IS NET? 

A. 4 bytes 

B. 6 bytes 

C. 8 bytes 

D. 16 bytes 

E. 20 bytes 

Answer:

Explanation: 

Routers are identified with NETs of 8 to 20 bytes. ISO/IEC 10589 distinguishes only three fields in the NSAP address format: a variable-length area address beginning with a single octet, a system ID, and a 1-byte n-selector. Cisco implements a fixed length of 6 bytes for the system ID, which is like the OSPF router ID. 

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


Q399. Which two statements best describe the difference between active mode monitoring and passive mode monitoring? (Choose two.) 

A. Passive mode monitoring uses IP SLA to generate probes for the purpose of obtaining information regarding the characteristics of the WAN links. 

B. Active mode monitoring is the act of Cisco PfR gathering information on user packets assembled into flows by NetfFow. 

C. Active mode monitoring uses IP SLA probes for obtaining performance characteristics of the current exit WAN link. 

D. Passive mode monitoring uses NetFlow for obtaining performance characteristics of the exit WAN links. 

Answer: C,D 

Explanation: 

. Passive and Active Monitoring 

Passive monitoring is the act of OER gathering information on user packets assembled into flows by NetFlow. OER, when enabled, automatically enables NetFlow on the managed interfaces on the border routers. By aggregating this information on the border routers and periodically reporting the collected data to the master controller, the network prefixes and applications in use can automatically be learned. Additionally, attributes like throughput, reachability, loading, packet loss, and latency can be deduced from the collected flows. Active monitoring is the act of generating IP SLA probes to generate test traffic for the purpose of obtaining information regarding the characteristics of the WAN links. Active probes can either be implicitly generated by OER when passive monitoring has identified destination hosts, or explicitly configured by the network manager in the OER configuration. 

Reference: http://products.mcisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/Transport_div ersity/Transport_Diversity_PfR.html#wp199209 


Q400. Now that we’ve generated the key, our next step would be to configure our vty lines for SSH access and specify which database we are going to use to provide authentication to the device. The local database on the router will do just fine for this example. 

LabRouter(config)#line vty 0 4 

LabRouter(config-line)#login local 

LabRouter(config-line)#transport input ssh 

5. You will need to create an account on the local router’s database to be used for authenticating to the device. This can be accomplished with these commands. LabRouter(config)#username XXXX privilege 15 secret XXXX 

Reference: http://blog.pluralsight.com/configure-secure-shell-ssh-on-cisco-router 


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