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Q57. - (Topic 1) 

Refer to the exhibit. 

What commands must be configured on the 2950 switch and the router to allow communication between host 1 and host 2? (Choose two.) 

A. Router(config)# interface fastethernet 0/0 Router(config-if)# ip address 192.168.1.1 255.255.255.0 Router(config-if)# no shut down 

B. Router(config)# interface fastethernet 0/0 Router(config-if)# no shut down Router(config)# interface fastethernet 0/0.1 Router(config-subif)# encapsulation dot1q 10 Router(config-subif)# ip address 192.168.10.1 255.255.255.0 

Router(config)# interface fastethernet 0/0.2 Router(config-subif)# encapsulation dot1q 20 Router(config-subif)# ip address 192.168.20.1 255.255.255.0 

C. Router(config)# router eigrp 100 Router(config-router)# network 192.168.10.0 Router(config-router)# network 192.168.20.0 

D. Switch1(config)# vlan database Switch1(config-vlan)# vtp domain XYZ Switch1(config-vlan)# vtp server 

E. Switch1(config)# interface fastethernet 0/1 Switch1(config-if)# switchport mode trunk 

F. Switch1(config)# interface vlan 1 Switch1(config-if)# ip default-gateway 192.168.1.1 

Answer: B,E 

Explanation: 

The two answers B and E list all the commands needed to configure interVLAN routing. Please notice that Cisco switch 2950, 2960 only support dot1Q trunking so we don’t need to specify which trunking encapsulation to use in this case. For Cisco switches 3550 or above we have to use these commands instead: 

Switch3550(config-if)#switchport trunk encapsulation dot1q Switch3550(config-if)#switchport mode trunk 

References: http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml https://learningnetwork.cisco.com/servlet/JiveServlet/download/5669-2461/Router%20on%20a%20Stick.pdf. 


Q58. - (Topic 2) 

What are two drawbacks of implementing a link-state routing protocol? (Choose two.) 

A. the sequencing and acknowledgment of link-state packets B. the requirement for a hierarchical IP addressing scheme for optimal functionality 

C. the high volume of link-state advertisements in a converged network 

D. the high demand on router resources to run the link-state routing algorithm 

E. the large size of the topology table listing all advertised routes in the converged network 

Answer: B,D 

Explanation: 

Link State routing protocols, such as OSPF and IS-IS, converge more quickly than their distance vector routing protocols such as RIPv1, RIPv2, EIGRP and so on, through the use of flooding and triggered updates. In link state protocols, changes are flooded immediately and computed in parallel. Triggered updates improve convergence time by requiring routers to send an update message immediately upon learning of a route change. These updates are triggered by some event, such as a new link becoming available oor an existing link failing. The main drawbacks to link state routing protocols are the amount of CPU overhead involved in calculating route changes and memory resources that are required to store neighbor tables, route tables and a complete topology table. http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4 


Q59. - (Topic 2) 

Refer to the exhibit. 

What address is a feasible successor? 

A. 172.16.4.0 

B. 10.1.4.4 

C. 10.1.2.2 

D. 172.16.3.0 

Answer: C Explanation: 

The feasible condition states: 

“To qualify as a feasible successor, a router must have an AD less than the FD of the current successor route”. 

In this case, we see 10.1.2.2 shows an AD less than the current successor of 10.1.4.4 


Q60. - (Topic 3) 

The output of the show frame-relay pvc command shows "PVC STATUS = INACTIVE". What does this mean? 

A. The PVC is configured correctly and is operating normally, but no data packets have been detected for more than five minutes. 

B. The PVC is configured correctly, is operating normally, and is no longer actively seeking the address of the remote router. 

C. The PVC is configured correctly, is operating normally, and is waiting for interesting traffic to trigger a call to the remote router. 

D. The PVC is configured correctly on the local switch, but there is a problem on the remote end of the PVC. 

E. The PVC is not configured on the local switch. 

Answer:

Explanation: The PVC STATUS displays the status of the PVC. The DCE device creates and sends the report to the DTE devices. There are 4 statuses: ACTIVE: the PVC is operational and can transmit dataINACTIVE: the connection from the local router to the switch is working, but the connection to the remote router is not availableDELETED: the PVC is not present and no LMI information is being received from the Frame Relay switch STATIC: the Local Management Interface (LMI) mechanism on the interface is disabled (by using the “no keepalive” command). This status is rarely seen. 


Q61. - (Topic 2) 

Refer to the exhibit. 

Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2? 

A. Any packet destined for a network that is not directly connected to router R1 will be dropped. 

B. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately. 

C. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1. 

D. The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks. 

E. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur. 

Answer:

Explanation: 

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128 0.0.0.31) so the packets destined for these networks will not be affected by the default route. The default route configured on R1 "ip route 0.0.0.0 0.0.0.0 serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn't drop anything so answers A, B and C are not correct. D is not correct too because these routes are declared in R1 and the question says that "OSPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks. As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to 

R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur. 


Q62. - (Topic 3) 

The command show frame-relay map gives the following output: 

Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active 

Which statements represent what is shown?(Choose three.) 

A. 192.168.151.4 represents the IP address of the remote router 

B. 192.168.151.4 represents the IP address of the local serial interface 

C. DLCI 122 represents the interface of the remote serial interface 

D. DLCI 122 represents the local number used to connect to the remote address 

E. broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC 

F. active indicates that the ARP process is working 

Answer: A,D,E 

Explanation: 

http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934 


Q63. - (Topic 1) 

Which three statements are typical characteristics of VLAN arrangements? (Choose three.) 

A. A new switch has no VLANs configured. 

B. Connectivity between VLANs requires a Layer 3 device. 

C. VLANs typically decrease the number of collision domains. 

D. Each VLAN uses a separate address space. 

E. A switch maintains a separate bridging table for each VLAN. 

F. VLANs cannot span multiple switches. 

Answer: B,D,E 

Explanation: 

By default, all ports on a new switch belong to VLAN 1 (default & native VLAN). There are also some well-known VLANs (for example: VLAN 1002 for fddi-default; VLAN 1003 for token-ring…) configured by default -> A is not correct. To communicate between two different VLANs we need to use a Layer 3 device like router or Layer 3 switch -> B is correct. VLANs don’t affect the number of collision domains, they are the same -> C is not correct. Typically, VLANs increase the number of broadcast domains.We must use a different network (or sub-network) for each VLAN. For example we can use 192.168.1.0/24 for VLAN 1, 192.168.2.0/24 for VLAN 2 -> D is correct. A switch maintains a separate bridging table for each VLAN so that it can send frame to 

ports on the same VLAN only. For example, if a PC in VLAN 2 sends a frame then the 

switch look-ups its bridging table and only sends frame out of its ports which belong to 

VLAN 2 (it also sends this frame on trunk ports) -> E is correct. 

We can use multiple switches to expand VLAN -> F is not correct. 


Q64. - (Topic 2) 

Refer to the exhibit. 

Host A pings interface S0/0 on router 3, what is the TTL value for that ping? 

A. 253 

B. 252 

C. 255 

D. 254 

Answer:

Explanation: 

From the CCNA ICND2 Exam book: “Routers decrement the TTL by 1 every time they forward a packet; if a router decrements the TTL to 0, it throws away the packet. This prevents packets from rotating forever.” I want to make it clear that before the router forwards a packet, the TTL is still remain the same. For example in the topology above, pings to S0/1 and S0/0 of Router 2 have the same TTL. 

The picture below shows TTL values for each interface of each router and for Host B. 

Notice that Host A initializes ICMP packet with a TTL of 255: