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Drag each IS-IS command on the left to its effect on the right. 


Q82. Refer to the exhibit. 

Which two configuration changes enable you to log in to the router? (Choose two.) 

A. Configure a user name and password on the device. 

B. Modify the default login authentication group to use the terminal line password. 

C. Remove the terminal line password on the console line. 

D. Modify the terminal lines to include transport input none. 

E. Configure the terminal lines to use the local user database. 

Answer: A,B 

Q83. Which three types of traffic are allowed by IEEE 802.1X access control prior to getting authenticated? (Choose three.) 







Answer: A,C,E 


Until the client is authenticated, IEEE 802.1x access control allows only Extensible Authentication Protocol over LAN (EAPOL), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP) traffic through the port to which the client is connected. After authentication, normal traffic passes through the port. 


Q84. Refer to the exhibit. 

Which statement is true? 

A. The command ip multicast rpf multitopology is missing from the configuration. 

B. Multitopology routing for multicast has been enabled for IS-IS. 

C. This output is invalid. 

D. The command mpls traffic-eng multicast-intact is configured on this router. 



The following is sample output from the show ip rpf command in a Multi-Topology Routing (MTR) routing environment. In Cisco IOS releases that support MTR, the “RPF topology” field was introduced to indicate which RIB topology is being used for the RPF lookup. For the “RPF topology” field in this example, the first topology listed (ipv4 multicast base) indicates where the nexthop of the RPF lookup is being conducted and the second topology listed (ipv4 unicast data) indicates where the route originated from. 

Router# show ip rpf 

RPF information for ? ( 

RPF interfacE. Ethernet1/0 

RPF neighbor: ? ( 

RPF route/mask: 

RPF typE. unicast (ospf 100) 

Doing distance-preferred lookups across tables 

RPF topology: ipv4 multicast base, originated from ipv4 unicast data 

The table below describes the fields shown in the displays. 

Table 15 show ip rpf Field Descriptions 



RPF information for 

Hostname and source address for which RPF information is displayed. 

RPF interface 

For the given source, the interface from which the router expects to receive packets. 

RPF neighbor 

For the given source, the neighbor from which the router expects to receive packets. 

RPF route/mask 

Route number and mask that matched against this source. 

RPF type 

Routing table from which this route was obtained, either unicast, MBGP, DVMRP, or static mroutes. 

RPF recursion count 

The number of times the route is recursively resolved. 

Doing distance-preferred 

Whether RPF was determined based on distance or length of mask. 

Using Group Based VRF Select, RPF VRF. 

The RPF lookup was based on the group address and the VRF where the RPF lookup is being performed. 

Metric preference 

The preference value used for selecting the unicast routing metric to the RP announced by the designated forwarder (DF). 


Unicast routing metric to the RP announced by the DF. 

RPF topology 

RIB topology being used for the RPF lookup, and, if originated from a different RIB topology, which RIB topology the route originated from. 


Q85. Refer to the exhibit. 

The VLAN-to-MST mapping is shown. (Assume SW1 acts as root for all possible MST instances.) 

spanning-tree mst configuration name MST 

revision 2 

instance 0 vlan 1-200,301-4094 instance 1 vlan 201-300 

If this topology is deployed, which action is required for traffic to flow on VLAN 200 and 300? 

A. Map VLAN 300 to instance 0. 

B. Map VLAN 200 to instance 2. 

C. Move instance 0 root to SW2. 

D. Move instance 1 root to SW2. 

E. Map both VLANs to instance 2. 


Updated 400-101 exam cost:

Q86. Refer to the exhibit. 

R2 is mutually redistributing between EIGRP and BGP. 

Which configuration is necessary to enable R1 to see routes from R3? 

A. The R3 configuration must include ebgp-multihop to the neighbor statement for R2. 

B. The R2 BGP configuration must include bgp redistribute-internal. 

C. R1 must be configured with next-hop-self for the neighbor going to R2. 

D. The AS numbers configured on R1 and R2 must match. 



Whenever you redistribute from BGP to something else, BGP will only advertise externally learned routes. To allow the redistribution of iBGP routes into an interior gateway protocol such as EIGRP or OSPF, use the bgp redistribute-internal command in router configuration mode. 

Q87. 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. 


Q88. Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI? 







Ethernet Relay Service (ERS or EVPL) 

An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs 

could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification. 

The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL. 


Q89. Which three statements about EVCs are true? (Choose three.) 

A. Spanning Tree must use MST mode on EVC ports. 

B. PAGP is supported on EVC ports. 

C. Spanning Tree must use RSTP mode on EVC ports. 

D. LACP is supported on EVC ports. 

E. Layer 2 multicast framing is supported. 

F. Bridge domain routing is required. 

Answer: A,B,D 


EVC support requires the following: 

–The spanning tree mode must be MST. 

–The dot1ad global configuration mode command must be configured. 

These Layer 2 port-based features can run with EVC configured on a port: 








Q90. When deploying redundant route reflectors in BGP, which attribute can you configure on the route reflector to allow routes to be identified as belonging to the same group? 







Together, a route reflector and its clients form a cluster. When a single route reflector is deployed in a cluster, the cluster is identified by the router ID of the route reflector. The bgp cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables.