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400-101 Exam Questions - Online Test


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Q1. Which two actions can you take to recover an interface in a errdisable state? (Choose two.) 

A. Enable UDLD on the switch. 

B. Enable errdisable recovery on the switch. 

C. Execute the shutdown command on the interface, followed by the no shutdown command. 

D. Remove the related commands from the configuration and reenter them. 

E. Enable loop guard on the switch. 

Answer: B,C 

Q2. Which two protocols are used to establish IPv6 connectivity over an MPLS network? (Choose two.) 

A. 6PE 

B. 6VPE 

C. RSVP 

D. ISATAP 

E. LDP 

F. IPv6IP 

Answer: A,B 

Q3. Refer to the exhibit. 

Which two benefits result from using this command on a switch? (Choose two.) 

A. The port cannot forward unknown unicast packets. 

B. Network security is increased on the configured port. 

C. The port cannot forward unknown multicast packets. 

D. The port cannot forward unknown broadcast packets. 

E. Network security is increased on all ports of the switch. 

F. Unknown packets of all types, except unicast, are blocked. 

Answer: A,B 

Q4. Which two options are interface requirements for turbo flooding? (Choose two.) 

A. The interface is Ethernet. 

B. The interface is configured for ARPA encapsulation. 

C. The interface is PPP. 

D. The interface is configured for GRE encapsulation. 

E. The interface is configured for 802.1Q encapsulation. 

Answer: A,B 

Explanation: 

In the switch, the majority of packets are forwarded in hardware; most packets do not go through the switch CPU. For those packets that do go to the CPU, you can speed up spanning tree-based UDP flooding by a factor of about four to five times by using turbo-flooding. This feature is supported over Ethernet interfaces configured for ARPA encapsulation. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400/software/release/12-2_50_se/configuration/guide/scg/swiprout.html 

Q5. DRAG DROP 

Drag and drop the QoS requirement on the left to the correct QoS technology on the right. 

Answer:  

Q6. DRAG DROP 

Drag and drop the BGP state on the left to the action that defines it on the right. 

Answer:  

Q7. Which two statements about BGP best-path selection are true? (Choose two.) 

A. The route with the highest local preference is preferred. 

B. The weight attribute is advertised to peers. 

C. The route with the lowest MED is preferred. 

D. A route that originates from iBGP peers is preferred. 

E. A route that originates from a router with a higher BGP router ID is preferred. 

F. The lowest weight advertised is preferred. 

Answer: A,C 

Q8. DRAG DROP 

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

Answer:  

Q9. Which statement about NAT64 is true? 

A. It uses one-to-one mapping between IPv6 addresses and IPv4 addresses. 

B. It requires static address mapping between IPv6 addresses and IPv4 addresses. 

C. It can be used to translate an IPv6 network to another IPv6 network. 

D. It can be configured for stateless and stateful translation. 

Answer:

Q10. Which statement about the feasible distance in EIGRP is true? 

A. It is the maximum metric that should feasibly be considered for installation in the RIB. 

B. It is the minimum metric to reach the destination as stored in the topology table. 

C. It is the metric that is supplied by the best next hop toward the destination. 

D. It is the maximum metric possible based on the maximum hop count that is allowed. 

Answer:

Explanation: 

An EIGRP router advertises each destination it can reach as a route with an attached metric. This metric is called the route's reported distance (the term advertised distance has also been used in older documentation). A successor route for any given destination is chosen as having the lowest computed feasible distance; that is, the lowest sum of reported distance plus the cost to get to the advertising router. By default, an EIGRP router will store only the route with the best (lowest) feasible distance in the routing table (or, multiple routes with equivalent feasible distances). 

Reference: http://packetlife.net/blog/2010/aug/9/eigrp-feasible-successor-routes/