Cisco 400-101 ExamCCIE Routing and Switching (v5.0)

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Q111. Which two statements about Metro Ethernet services are true? (Choose two.) 

A. EPL is a point-to-point service from one customer site to another across an MPLS 

backbone. 

B. EVPL is a multipoint service that emulates a LAN over an MPLS backbone. 

C. EPLAN is a multipoint service that emulates a LAN over an MPLS backbone. 

D. EVPL is a point-to-point service from one customer site to another across an MPLS backbone. 

E. ELAN is a point-to-point service from one customer site to another across an MPLS backbone. 

F. EVPL is a multipoint service with a root node that is suitable for multicast services. 

Answer: A,B 


Q112. DRAG DROP 

Drag and drop the IPv6 prefix on the left to the correct address type on the right. 

Answer: 


Q113. Refer to the exhibit. 

Which statement about the R1 configuration is true? 

A. It supports the service timestamps log uptime command to display time stamps. 

B. The logging buffer command was used to increase the default of the buffer. 

C. The logging of warning messages is disabled. 

D. Log message sequence numbering is disabled. 

Answer:

Explanation: 

To disable sequence numbers, use the no service sequence-numbers global configuration command. 

This example shows part of a logging display with sequence numbers enableD. 000019: %SYS-5-CONFIG_I: Configured from console by vty2 (10.34.195.36) 

In this example we see the absence of sequence numbers on the log messages. 

Not A. In this example there are no time stamps or uptimes shown in the logs. 

Not B. The default buffer size is 4096 bytes. 

Not C. The logging level in this example is informational (level 6), which will display levels 0-6 in the logs. Warnings are level 4. 


Q114. Refer to the exhibit. 

Your network is suffering excessive output drops. Which two actions can you take to resolve the problem? (Choose two.) 

A. Install a switch with larger buffers. 

B. Configure a different queue set. 

C. Reconfigure the switch buffers. 

D. Configure the server application to use TCP. 

E. Update the server operating system. 

Answer: A,B 

Explanation: 

Installing a switch with larger buffers and correctly configuring the buffers can solve output queue problems. 

For each queue we need to configure the assigned buffers. The buffer is like the ‘storage’ space for the interface and we have to divide it among the different queues. This is how to do it: 

mls qos queue-set output <queue set> buffers Q1 Q2 Q3 Q4 

In this example, there is nothing hitting queue 2 or queue 3 so they are not being utilized. 


Q115. Which LSA type is associated with the default route in a totally stubby area? 

A. interarea-prefix LSA for ABRs (Type 3) 

B. autonomous system external LSA (Type 5) 

C. router LSA (Type 1) 

D. interarea-router LSAs for ASBRs (Type 4) 

Answer:


Q116. How does having an EIGRP feasible successor speed up convergence? 

A. EIGRP sends queries only if there is a feasible successor, which decreases the number of routers that are involved in convergence. 

B. EIGRP sends queries only if there is not a feasible successor, which causes less control traffic to compete with data. 

C. EIGRP immediately installs the loop-free alternative path in the RIB. 

D. EIGRP preinstalls the feasible successor in the RIB in all cases, which causes traffic to switch more quickly. 

Answer:

Explanation: 

Feasible Successor 

. A next-hop router that serves as backup to the current successor. 

. The condition is that the said router’s AD (or RD) is less than the FD of the current successor route. 

. Once the feasible successor is selected, they are placed in the topology table. If a change in topology occurs which requires a new route, DUAL looks for the feasible successor and uses it as new route immediately, resulting in fast convergence. 

Reference: http://routemyworld.com/2008/07/page/2/ 


Q117. Which two statements about OSPF route types are true? (Choose two.) 

A. The cost of an external type 2 route is the sum of the external and internal costs. 

B. The cost of an external type 2 route is the same as the external cost. 

C. Intra-area routes originate outside of their area. 

D. Inter-area routes originate inside their area. 

E. The cost of an external type 1 route is the same as the internal cost. 

F. For routes to the same destination, external type 1 routes are preferred over external type 2 routes. 

Answer: B,F 

Explanation: 

External routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. A type 1 route is always preferred over a type 2 route for the same destination. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html 


Q118. DRAG DROP 

Drag and drop the protocol on the left to the corresponding administrative distance on the right. 

Answer: 


Q119. Refer to the exhibit. 

Which statement describes what the authoritative flag indicates? 

A. Authentication was used for the mapping. 

B. R1 learned about the NHRP mapping from a registration request. 

C. Duplicate mapping in the NHRP cache is prevented. 

D. The registration request had the same flag set. 

Answer:

Explanation: 

Show NHRP: Examples 

The following is sample output from the show ip nhrp command: 

Router# show ip nhrp 

10.0.0.2 255.255.255.255, tunnel 100 created 0:00:43 expire 1:59:16 

TypE. dynamic Flags: authoritative 

NBMA address: 10.1111.1111.1111.1111.1111.1111.1111.1111.1111.11 

10.0.0.1 255.255.255.255, Tunnel0 created 0:10:03 expire 1:49:56 

TypE. static Flags: authoritative 

The fields in the sample display are as follows: 

Flags: 

authoritative—Indicates that the NHRP information was obtained from the Next Hop Server or router that maintains the NBMA-to-IP address mapping for a particular destination. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html 


Q120. What is the destination multicast MAC address for BPDUs on the native VLAN, for a switch that is running 802.1D? 

A. 0185. C400. 0000 

B. 0100.0CCC.CCCC 

C. 0100.0CCC.CCCD 

D. 0180.C200.0000 

Answer:

Explanation: 

If the native vlan is 1: 

A STP BPDU for VLAN 1 will be sent untagged to MAC 0180.c200.0000 (this is the 

common spanning tree) 

A PVST+ BPDU for VLAN 1 will be sent untagged to MAC 0100.0ccc.cccd 

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd 

(with a PVID = to the VLAN) 

If the native vlan is not 1: 

A STP BPDU for VLAN 1 will be sent untagged (on the native vlan) to MAC 

0180.c200.0000 (this is the common spanning tree) 

A PVST+ BPDU for VLAN1 will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID=1) 

A PVST+ BPDU for the native vlan will be sent untagged to MAC 0100.0ccc.cccd (with a PVID=native vlan) 

A PVST+ BPDU for all other vlans will be sent with a 802.1Q tag to MAC 0100.0ccc.cccd (with a PVID = to the VLAN) 


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