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400-101 Product Description:
Exam Number/Code: 400-101 vce
Exam name: CCIE Routing and Switching (v5.0)
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Certification: Cisco Certification
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Examcollection offers free demo for 400 101 dumps exam. "CCIE Routing and Switching (v5.0)", also known as cisco 400 101 exam, is a Cisco Certification. This set of posts, Passing the Cisco 400 101 vce exam, will help you answer those questions. The cisco 400 101 Questions & Answers covers all the knowledge points of the real exam. 100% real Cisco cisco 400 101 exams and revised by experts!

Q191. In an STP domain, which two statements are true for a nonroot switch, when it receives a configuration BPDU from the root bridge with the TC bit set? (Choose two.) 

A. It sets the MAC table aging time to max_age + forward_delay time. 

B. It sets the MAC table aging time to forward_delay time. 

C. It recalculates the STP topology upon receiving topology change notification from the root switch. 

D. It receives the topology change BPDU on both forwarding and blocking ports. 

Answer: B,D 


When the TC bit is received, every bridge is then notified and reduces the aging time to forward_delay (15 seconds by default) for a certain period of time (max_age + forward_delay). It is more beneficial to reduce the aging time instead of clearing the table because currently active hosts, that effectively transmit traffic, are not cleared from the table. Once the root is aware that there has been a topology change event in the network, it starts to send out its configuration BPDUs with the topology change (TC) bit set. These BPDUs are relayed by every bridge in the network with this bit set. As a result all bridges become aware of the topology change situation and it can reduce its aging time to forward_delay. Bridges receive topology change BPDUs on both forwarding and blocking ports. An important point to consider here is that a TCN does not start a STP recalculation. This fear comes from the fact that TCNs are often associated with unstable STP environments; TCNs are a consequence of this, not a cause. The TCN only has an impact on the aging time. It does not change the topology nor create a loop. 

Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/12013-17.html#topic1 

Q192. Refer to the exhibit. 

Which two issues can cause the interface VLAN10 to be down/down? (Choose two.) 

A. The VLAN is inactive or has been removed from the VLAN database. 

B. STP is in a forwarding state on the port. 

C. A Layer 2 access port is configured with VLAN10, but is in a down/down state. 

D. The autostate exclude feature was used on interface VLAN10. 

Answer: A,C 

Q193. Refer to the exhibit. 

Which statement about authentication on Router A is true? 

A. The router will attempt to authenticate users against TACACS+ only. 

B. The router will attempt to authenticate users against the local database only. 

C. The router will attempt to authenticate users against the local database first, and fall back to TACACS+ if the local database authentication fails. 

D. The router will authenticate users against the default database only. 

E. The router will attempt to authenticate users against TACACS+ first, and fall back to the local database if the TACACS+ authentication fails. 


Q194. Which two statements about UDP and latency are true? (Choose two.) 

A. UDP is connection oriented, so the size of a UDP stream is independent of latency. 

B. UDP is connection oriented, so latency can increase the size of a UDP stream. 

C. UDP is connectionless, so latency can increase the size of a UDP stream. 

D. If latency decreases, throughput also decreases. 

E. If latency increases, throughput also increases. 

F. Latency can cause jitter on UDP connections. 

Answer: C,F 

Q195. Which two message types allow PIM snooping to forward multicast traffic? (Choose two.) 

A. hello messages 

B. leave messages 

C. membership query messages 

D. bidirectional PIM DF election messages 

Answer: A,D 

Q196. Which three protocols can use enhanced object tracking? (Choose three.) 


B. Proxy-ARP 





Answer: A,C,D 


The Enhanced Object Tracking feature separates the tracking mechanism from HSRP and creates a separate standalone tracking process that can be used by other processes and HSRP. This feature allows tracking of other objects in addition to the interface line-protocol state. A client process such as HSRP, Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP), can register its interest in tracking objects and then be notified when the tracked object changes state. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/15-mt/iap-15-mt-book/iap-eot.html 

Q197. Refer to the exhibit. 

What is the polling frequency set by this configuration? 

A. 60 seconds 

B. 10 seconds 

C. 360 seconds 

D. 60 milliseconds 

E. 10 milliseconds 



The frequency value lists the polling interval, in seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html 

Q198. What is the maximum number of classes that MQC can support in a single policy map? 

A. 512 

B. 256 

C. 128 

D. 64 


Q199. Which two discovery mechanism does LDP support? (Choose two.) 

A. strict 

B. extended 

C. loose 

D. targeted 

E. basic 

Answer: B,E 


Drag and drop the NetFlow Export feature on the left to the NetFlow version that first supported it on the right. 


To know more about the CCIE Routing and Switching (v5.0), click here.