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Q391. Which three statements are true about VSS? (Choose three.) 

A. VSS separates the control planes of the active and the standby chassis. 

B. Configuration changes can be made on both active and standby chassis. 

C. When the VSS active chassis recovers after a failure, it initiates a switchover and takes on the active role again. 

D. VSS unifies the control planes of the active and the standby chassis. 

E. HSRP configuration is not required to run VSS. 

F. The VSS standby chassis monitors the VSS active chassis using the VSL. 

Answer: D,E,F 


VSS operates on a unified control plane with a distributed forwarding architecture in which the active supervisor (or switch) is responsible for actively participating with the rest of the network and for managing and maintaining control plane information. VSS actually removes the need for a next-hop redundancy protocol like HSRP or VRRP. These first-hop redundancy protocols are usually heavily tied to a fast-converging routing protocol like EIGRP, and still require that each device maintain its own control plane. The standby chassis monitors the active chassis using the VSL. If it detects failure, the standby chassis initiates a switchover and takes on the active role. When the failed chassis recovers, it takes on the standby role. 


Q392. Refer to the exhibit. 

R3 is failing to join the multicast group that is sourcing from R1. Which two actions can you take to allow multicast traffic to flow correctly? (Choose two.) 

A. Remove the static multicast route on R1. 

B. Configure OSPF on R1 and R3 to include the tunnel interfaces. 

C. Add an additional static multicast route on R2 for multicast group toward R3. 

D. Replace the static multicast route on R1 to send traffic toward R2. 

E. Remove the static unicast route on R1. 

F. Add an additional static unicast route on R2 toward the loopback interface of R3. 

Answer: A,B 


Since the tunnel interfaces are not part of OSPF, the best path to the multicast source of R1 from R3 would be over the Gi0/0 path via OSPF. However, the static mroute is configured to use the tunnel, so this causes an RPF failure used in Sparse Mode. Best fix is to add the tunnel interfaces into OSPF and remove the static mroute so that that the RPF check no longer fails. 

Q393. Refer to the exhibit. 

All switches are Cisco switches. Assume that Cisco Discovery Protocol is enabled only on switches A and C. 

Which information is returned when you issue the command show cdp neighbors on switch C? 

A. a limited amount of information about switch B 

B. no neighbor details will be returned 

C. neighbor details for switch B 

D. neighbor details for switch A 

E. neighbor details for switch C 



CDP is used to discover information on directly connected neighbors only, so in this case SwitchC would only be able to obtain CDP information from SwitchB. However, since SwitchB is not running CDP then no neighbor information will be seen on SwitchC. Same goes for Switch A also in this topology. 


Drag and drop the IGMPv2 timer on the left to its default value on the right. 



Drag and drop each MLPPP command on the left to the function it performs on the right. 


Q396. Refer to the exhibit. 

NHRP registration is failing; what might be the problem? 

A. invalid IP addressing 

B. fragmentation 

C. incorrect NHRP mapping 

D. incorrect NHRP authentication 



Configuring an authentication string ensures that only routers configured with the same string can communicate using NHRP. Therefore, if the authentication scheme is to be used, the same string must be configured in all devices configured for NHRP on a fabric 

Reference: p1055432 

Q397. Refer to the exhibit. 

Why is the host unable to obtain an IP address? 

A. IP source guard is configured on the switch port. 

B. The DHCP server pool addresses are configured incorrectly. 

C. DHCP requests are being blocked. 

D. DHCP option 150 is disabled. 



Drag and Drop Cisco PFR adjacency types. 


Q399. Refer to the exhibit. 

Which option is the most likely explanation of the duplicate address message logged? 

A. HSRP misconfiguration 

B. a PC with IP of 

C. spanning-tree-loop 

D. a hardware problem 


Q400. Which two statements about port ACLs are true? (Choose two.) 

A. Port ACLs are supported on physical interfaces and are configured on a Layer 2 interface on a switch. 

B. Port ACLs support both outbound and inbound traffic filtering. 

C. When it is applied to trunk ports, the port ACL filters only native VLAN traffic. 

D. When it is applied to a port with voice VLAN, the port ACL filters both voice and data VLAN traffic. 

Answer: A,D 


PACLs filter incoming traffic on Layer 2 interfaces, using Layer 3 information, Layer 4 header information, or non-IP Layer 2 information The port ACL (PACL) feature provides the ability to perform access control on specific Layer 2 ports. A Layer 2 port is a physical LAN or trunk port that belongs to a VLAN. Port ACLs perform access control on all traffic entering the specified Layer 2 port, including voice and data VLANs that may be configured on the port. Port ACLs are applied only on the ingress traffic.