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Q61. Which option is the default maximum age of the MAC address table? 

A. 300 seconds 

B. 500 seconds 

C. 1200 seconds 

D. 3600 seconds 

Answer:

Explanation: 

To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode. 

Syntax Description 

seconds 

MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1. html 


Q62. Which statement about the NHRP network ID is true? 

A. It is sent from the spoke to the hub to identify the spoke as a member of the same NHRP domain. 

B. It is sent from the hub to the spoke to identify the hub as a member of the same NHRP domain. 

C. It is sent between spokes to identify the spokes as members of the same NHRP domain. 

D. It is a locally significant ID used to define the NHRP domain for an interface. 

Answer:

Explanation: 

The NHRP network ID is used to define the NHRP domain for an NHRP interface and differentiate between multiple NHRP domains or networks, when two or more NHRP domains (GRE tunnel interfaces) are available on the same NHRP node (router). The NHRP network ID is used to help keep two NHRP networks (clouds) separate from each other when both are configured on the same router. The NHRP network ID is a local only parameter. It is significant only to the local router and it is not transmitted in NHRP packets to other NHRP nodes. For this reason the actual value of the NHRP network ID configured on a router need not match the same NHRP network ID on another router where both of these routers are in the same NHRP domain. As NHRP packets arrive on a GRE interface, they are assigned to the local NHRP domain in the NHRP network ID that is configured on that interface. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/ios/12_4/ip_addr/configuration/guide/hadnhrp.html 


Q63. Which three routing protocols utilize TLVs? (Choose three.) 

A. BGP 

B. IS-IS 

C. ODR 

D. OSPF 

E. EIGRP 

F. RIP 

Answer: A,B,E 

Explanation: 

IS-IS, originally designed for Open System Interconnection (OSI) routing, uses TLV parameters to carry information in Link State Packets (LSPs). The TLVs make IS-IS extendable. IS-IS can therefore carry different kinds of information in the LSPs. Several routing protocols use TLVs to carry a variety of attributes. Cisco Discovery Protocol (CDP), Label Discovery Protocol (LDP), and Border Gateway Protocol (BGP) are examples of protocols that use TLVs. BGP uses TLVs to carry attributes such as Network Layer Reachability Information (NLRI), Multiple Exit Discriminator (MED), and local pReference: The IP header of the EIGRP packet specifies IP protocol number 88 within it, and the maximum length of the packet will be the IP MTU of the interface on which it is transmitted, most of the time 1500 octets. Following the IP header is the various Type/Length/Value (TLV) triplets. These TLVs will not only carry the route entries but also provide fields for the management of the DUAL process, multicast sequencing, and IOS software versions from the router. 

References: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/5739-tlvs-5739.html http://ericleahy.com/index.php/eigrp-packets-neighborships/ 


Q64. Refer to the exhibit. 

What is a reason for the RIB-failure? 

A. CEF is not enabled on this router. 

B. The route 10.100.1.1/32 is in the routing table, but not as a BGP route. 

C. The routing table has yet to be updated with the BGP route. 

D. The BGP route is filtered inbound and hence is not installed in the routing table. 

Answer:

Explanation: 

A rib-failure occurs when BGP tries to install the bestpath prefix into the RIB, but the RIB rejects the BGP route because a route with better administrative distance already exists in the routing table. An inactive Border Gateway Protocol (BGP) route is a route that is not installed in the RIB, but is installed in the BGP table as rib-failure. Example Topology Router 1 (R1) and router 2 (R2) have two parallel links; one links runs BGP AS 65535 and the other link runs Enhanced Interior Gateway Routing Protocol (EIGRP) AS 1. Both BGP and EIGRP are advertising the network 10.1.1.1/32 on R1. 

R2 learns about the 1.1.1.1/32 route through both EIGRP and BGP, but installs only the EIGRP route in the routing table because of the lower administrative distance. Since the BGP route is not installed in the R2 routing table, the route appears as a rib-failure in the R2 BGP table. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116146-config-bgp-next-hop-00.html 


Q65. Which two statements about BPDU guard are true? (Choose two.) 

A. The global configuration command spanning-tree portfast bpduguard default shuts down interfaces that are in the PortFast-operational state when a BPDU is received on that port. 

B. The interface configuration command spanning-tree portfast bpduguard enable shuts down only interfaces with PortFast enabled when a BPDU is received. 

C. BPDU guard can be used to prevent an access port from participating in the spanning tree in the service provider environment. 

D. BPDU guard can be used to protect the root port. 

E. BPDU guard can be used to prevent an invalid BPDU from propagating throughout the network. 

Answer: A,C 


Down to date 400-101 simulations:

Q66. 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 

B. OSPF 

C. RIP 

D. EIGRP 

E. An empty route set 

Answer:

Explanation: 

This command shows supernets only; it does not show subnets. In this case, the routing table would contain the 10.0.0.0/24 subnet, but not the 10.0.0.0/8 supernet. 


Q67. DRAG DROP 

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

Answer: 


Q68. Which two statements about VPLS are true? (Choose two.) 

A. Split horizon is used on PE devices to prevent loops. 

B. Spanning tree is extended from CE to CE. 

C. IP is used to switch Ethernet frames between sites. 

D. PE routers dynamically associate to peers. 

E. VPLS extends a Layer 2 broadcast domain. 

Answer: A,E 


Q69. DRAG DROP 

Drag and drop the EIGRP query condition on the left to the corresponding action taken by the router on the right. 

Answer: 


Q70. Refer to the exhibit. 

With these configurations for R1 and R2, which statement about PPP authentication is true? 

A. Authentication fails because R1 is missing a username and password. 

B. R2 responds with the correct authentication credentials. 

C. R2 requires authentication from R1. 

D. R1 requires authentication from R2. 

Answer:

Explanation: 

Only R2 is configured with the “PPP authentication PAP” command so it requires authentication from R1, but R1 does not require authentication from R2.