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2016 Jul testking 400-101:

Q281. Which two statements about MPLS VPNs are true? (Choose two.) 

A. PE routers maintain customer routes in the VPN for that customer. 

B. They use the explicit-null label by default. 

C. P routers are used only for label transit. 

D. P routers maintain customer routes in the VPN for that customer. 

E. They support only one route target. 

F. Each interface on a PE router must have its own VRF. 

Answer: A,C 

Q282. Which statement describes the difference between a stub area and a totally stub area? 

A. The ABR advertises a default route to a totally stub area and not to a stub area. 

B. Stub areas do not allow LSA types 4 and 5, while totally stub areas do not allow LSA types 3, 4, and 5. 

C. Totally stub areas allow limited external routes in the area via a special type 7 LSA, while stub areas do not. 

D. Stub areas do not allow external LSAs, ASBR summary LSAs, or summary LSAs with the exception of a default route originated by the ABR via a summary LSA. 

Answer: B 


. Standard areas can contain LSAs of type 1, 2, 3, 4, and 5, and may contain an ASBR. The backbone is considered a standard area. 

. Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes. 

. Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA. The type 3 LSA describes a default route, substituted for all external and inter-area routes. 

. Not-so-stubby areas implement stub or totally stubby functionality yet contain an ASBR. Type 7 LSAs generated by the ASBR are converted to type 5 by ABRs to be flooded to the rest of the OSPF domain. 


Q283. Which protocol will accept incoming updates when the passive-interface command is configured? 





Answer: C 

Q284. 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 


Q285. Which two statements are characteristics of Ethernet private LAN circuits? (Choose two.) 

A. They support communication between two or more customer endpoints. 

B. They utilize more than one bridge domain. 

C. They support point-to-multipoint EVC. 

D. They support multipoint-to-multipoint EVC. 

Answer: A,D 


An Ethernet Private LAN (EPLAN) is a multipoint–to–multipoint EVC. EPLAN is an EVC that supports communication between two or more UNIs. In EPLAN, only one EVC can exist on a port and the port can have only one EFP. 

Reference: ion/cpt93_configuration_chapter_0100.pdf 

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Most up-to-date ccie written 400-101:

Q286. In a PfR environment, which two statements best describe the difference between active mode monitoring and fast mode monitoring? (Choose two.) 

A. Active mode monitoring can monitor and measure actual traffic via NetFlow data collection. 

B. Fast mode monitoring can measure bursty traffic better than active mode. 

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

D. Fast mode monitoring uses IP SLA probes via all valid exits continuously to quickly determine an alternate exit link. 

Answer: C,D 


Active Monitoring 

PfR uses Cisco IOS IP Service Level Agreements (SLAs) to enable active monitoring. IP SLAs support is enabled by default. IP SLAs support allows PfR to be configured to send active probes to target IP addresses to measure the jitter and delay, determining if a prefix is out-of-policy and if the best exit is selected. The border router collects these performance statistics from the active probe and transmits this information to the master controller. 

Fast Failover Monitoring 

Fast failover monitoring enables passive and active monitoring and sets the active probes to continuously monitor all the exits (probe-all). Fast failover monitoring can be used with all types of active probes: Internet Control Message Protocol (ICMP) echo, jitter, TCP connection, and UDP echo. 


Q287. Refer to the exhibit. 

While troubleshooting high CPU utilization of a Cisco Catalyst 4500 Series Switch, you notice the error message that is shown in the exhibit in the log file. 

What can be the cause of this issue, and how can it be prevented? 

A. The hardware routing table is full. Redistribute from BGP into IGP. 

B. The software routing table is full. Redistribute from BGP into IGP. 

C. The hardware routing table is full. Reduce the number of routes in the routing table. 

D. The software routing table is full. Reduce the number of routes in the routing table. 

Answer: C 



Error MessageC4K_L3HWFORWARDING-2-FWDCAMFULL:L3 routing table is full. 

Switching to software forwarding. 

The hardware routing table is full; forwarding takes place in the software instead. The switch performance might be degraded. 

Recommended Action: Reduce the size of the routing table. Enter the ip cef command to return to hardware forwarding. 


Q288. Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.) 

A. the forwarding information base 

B. the label forwarding information base 

C. the IP routing table 

D. the label information table 

E. the adjacency table 

Answer: A,B 


The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and frames. 

The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS. 

Q289. Refer to the exhibit. 

The customer wants to use IP SLA to create a failover to ISP2 when both Ethernet connections to ISP1 are down. The customer also requires that both connections to ISP1 are utilized during normal operations. 

Which IP route configuration accomplishes these requirements for the customer? 

A. ip route track 1 

ip route track 2 

ip route track 3 

B. ip route track 1 

ip route track 2 

ip route track 4.100 

C. ip route track 1 

ip route track 2 

ip route track 3.100 

D. ip route track 1 1 

ip route track 2 2 

ip route track 3 3 

Answer: C 


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