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2017 Mar 400-101 practice test

Q391. Which ICMP message type is used to assist path MTU discovery? 

A. destination unreachable 

B. redirect message 

C. source quench 

D. time exceeded 


Q392. How are the Cisco Express Forwarding table and the FIB related to each other? 

A. The FIB is used to populate the Cisco Express Forwarding table. 

B. The Cisco Express Forwarding table allows route lookups to be forwarded to the route processor for processing before they are 

C. There can be only one FIB but multiple Cisco Express Forwarding tables on IOS devices. 

D. Cisco Express Forwarding uses a FIB to make IP destination prefix-based switching decisions. 


Q393. A floating static route appears in the routing table of an interface even when the interface is unusable. 

Which action can you take to correct the problem? 

A. Remove the permanent option from the static route. 

B. Correct the administrative distance. 

C. Configure the floating static route to point to another route in the routing table. 

D. Correct the DHCP-provided route on the DHCP server. 


Q394. Refer to the exhibit. 

Which route type is displayed when you enter the command show ip route supernets-only on a device with this configuration? 

A. Connected 




E. An empty route set 



This command shows supernets only; it does not show subnets. In this case, the routing table would contain the subnet, but not the supernet. 


Drag and drop the SNMP element on the left to the corresponding definition on the right. 


Up to date 400-101 answers:

Q396. Refer to the exhibit. 

Which statement is true? 

A. IS-IS has been enabled on R4 for IPv6, single-topology. 

B. IS-IS has been enabled on R4 for IPv6, multitopology. 

C. IS-IS has been enabled on R4 for IPv6, single-topology and multitopology. 

D. R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not been enabled under router IS-IS. 



When working with IPv6 prefixes in IS-IS, you can configure IS-IS to be in a single topology for both IPv4 and IPv6 or to run different topologies for IPv4 and IPv6. By default, IS-IS works in single-topology mode when activating IPv4 and IPv6. This means that the IS-IS topology will be built based on IS Reachability TLVs. When the base topology is built, then IPv4 prefixes (IP Reachability TLV) and IPv6 prefixes (IPv6 Reachability TLV) are added to each node as leaves, without checking if there is IPv6 connectivity between nodes. 


Q397. Which two issues is TCP Sequence Number Randomization designed to prevent? (Choose two.) 

A. DDOS attacks 

B. OS fingerprinting 

C. man-in-the-middle attacks 

D. ARP poisoning 

E. Smurf attack 

Answer: B,C 

Q398. Which statement describes what it means if a router has an OSPF priority set to 0? 

A. A router with the OSPF priority set to 0 is one that can participate in the election of a DR. It has the highest priority. 

B. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR, but it can become a BDR 

C. A router with the OSPF priority set to 0 is one that cannot participate in the election of a DR. It can become neither a DR nor a BDR. 

D. A router with the OSPF priority set to 0 is one that cannot participate in the election of a BDR, but it can become a DR 


Q399. Refer to the exhibit. 

The spokes of the DMVPN with the given configuration are having QoS issues. 

Which two actions can you take to resolve the problem? (Choose two.) 

A. Configure qos pre-classify on the tunnel interface. 

B. Configure an NHRP group on the tunnel interface and associate it to a QoS policy. 

C. Modify the configuration of the IPsec policy to accept QoS policies. 

D. Manually configure a QoS policy on the serial interface. 

E. Configure the bandwidth statement on the tunnel interface. 

F. Configure the bandwidth statement on the serial interface. 

Answer: A,B 


It is possible to classify based on information that is encrypted, which is needed in this example. You can use an access-list, configured to match the private subnet behind the remote spoke. The qos pre-classify command is used on the tunnel interface, and is required because the traffic is classified by a parameter that is encrypted as the traffic leaves the physical outbound interface. L4 information from the IP data packet can also classify traffic destined to the same private subnet. The “nhrp map group group-name service-policy output parent-policy-name” command adds the NHRP group to the QoS policy map on the hub. 

Q400. Which two improvements do SIA-Query and SIA-Reply messages add to EIGRP? (Choose two.) 

A. Stuck-in-active conditions are solved faster. 

B. They prevent a route from going into the stuck-in-active state. 

C. They help in the localization of the real failure in the network. 

D. The EIGRP adjacency between two neighbors never goes down. 

Answer: A,C