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Q11. - (Topic 2) 

Refer to the exhibit. 

How will the router handle a packet destined for 192.0.2.156? 

A. The router will drop the packet. 

B. The router will return the packet to its source. 

C. The router will forward the packet via Serial2. 

D. The router will forward the packet via either Serial0 or Serial1. 

Answer:

Explanation: 

Router has pointed default router to 192.168.4.1 and this subnet is connected via serial 2 interface. Router does not have router for the 192.0.2.156. so it will use the default gateway 

192.168.4.1. A default route identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route. 


Q12. - (Topic 3) 

What command is used to verify the DLCI destination address in a Frame Relay static configuration? 

A. show frame-relay pvc 

B. show frame-relay lmi 

C. show frame-relay map 

D. show frame relay end-to-end 

Answer:

Explanation: 

Cisco Frame Relay Configurations http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=9 show frame-relay map The show frame-relay map privileged EXEC mode command shows the contents of the next hop protocol address to DLCI mapping table on the router. The table contains both dynamic mapped and static mapped entries. The below example shows a sample output of the show frame-relay map command. Router#show frame-relay map Serial1/2 (up): ip 172.16.1.4 dlci 401(0x191,0x6410), dynamic, broadcast,, status defined, active Serial1/2 (up): ip 172.16.1.5 dlci 501(0x1F5,0x7C50), dynamic, broadcast,, status defined, active Serial1/2 (up): ip 172.16.1.2 dlci 301(0x12D,0x48D0), dynamic, broadcast,, status defined, active 


Q13. - (Topic 3) 

What occurs on a Frame Relay network when the CIR is exceeded? 

A. All TCP traffic is marked discard eligible. 

B. All UDP traffic is marked discard eligible and a BECN is sent. 

C. All TCP traffic is marked discard eligible and a BECN is sent. 

D. All traffic exceeding the CIR is marked discard eligible. 

Answer:

Explanation: 

Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the congestion occurs within the Frame Relay network. Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded. 


Q14. - (Topic 1) 

Refer to the exhibit. 

The output that is shown is generated at a switch. Which three statements are true? (Choose three.) 

A. All ports will be in a state of discarding, learning, or forwarding. 

B. Thirty VLANs have been configured on this switch. 

C. The bridge priority is lower than the default value for spanning tree. 

D. All interfaces that are shown are on shared media. 

E. All designated ports are in a forwarding state. 

F. This switch must be the root bridge for all VLANs on this switch. 

Answer: A,C,E 

Explanation: 

From the output, we see that all ports are in Designated role (forwarding state) -> A and E 

are correct. 

The command “show spanning-tree vlan 30 only shows us information about VLAN 30. We 

don’t know how many VLAN exists in this switch -> B is not correct. 

The bridge priority of this switch is 24606 which is lower than the default value bridge 

priority 32768 -> C is correct. 

All three interfaces on this switch have the connection type “p2p”, which means Point-to-point environment – not a shared media -> D is not correct. 

The only thing we can specify is this switch is the root bridge for VLAN 3o but we can not 

guarantee it is also the root bridge for other VLANs -> F is not correct. 


Q15. - (Topic 2) 

Which parameter or parameters are used to calculate OSPF cost in Cisco routers? 

A. Bandwidth 

B. Bandwidth and Delay 

C. Bandwidth, Delay, and MTU 

D. Bandwidth, MTU, Reliability, Delay, and Load 

Answer:

Explanation: 

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.sht ml#t6 

OSPF Cost 

The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth of that interface. A higher bandwidth indicates a lower cost. There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than crossing a 10M Ethernet line. The formula used to calculate the cost is: Cost= 10000 0000/bandwidth in bps 

For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10 EXP8/1544000 =64 to cross a T1 line. By default, the cost of an interface is calculated based on the bandwidth; you can force the cost of an interface with the ip ospf cost <value> interface sub configuration mode command. 


Q16. - (Topic 3) 

What does the frame-relay interface-dlci command configure? 

A. local DLCI on the subinterface 

B. remote DLCI on the main interface 

C. remote DCLI on the subinterface 

D. local DLCI on the main interface 

Answer:

Explanation: 

Frame Relay for ICND Exam http://www.ciscopress.com/articles/article.asp?p=100603&seqNum=3 

To assign a data-link connection identifier (DLCI) to a specified Frame Relay subinterface on the router or access server, or to assign a specific permanent virtual circuit (PVC) to a DLCI, or to apply a virtual template configuration for a PPP session, use the frame-relay interface-dlci interface configuration command Example 4-23 Example of frame-relay interface-dlci Command and the Output of show frame-relay map R4(config)#interface s1/2.403 point-to-point R4(config-subif)#frame-relay interface-dlci ? <16-1007> Define a switched or locally terminated DLCI R4(config-subif)#frame-relay interface-dlci 403 ? cisco Use CISCO Encapsulation ietf Use RFC1490/RFC2427 Encapsulation 

ppp Use RFC1973 Encapsulation to support PPP over FR protocol Optional protocol information for remote end <cr> R4#show frame-relay map Serial1/2.403 (up): point-to-point dlci, dlci 403(0xC9,0x3090), broadcast status defined, active R4# 


Q17. - (Topic 3) 

What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology? 

A. It avoids split-horizon issues with distance vector routing protocols. 

B. IP addresses can be conserved if VLSM is not being used for subnetting. 

C. A multipoint interface offers greater security compared to point-to-point subinterface configurations. 

D. The multiple IP network addresses required for a multipoint interface provide greater addressing flexibility over point-to-point configurations. 

Answer:

Explanation: 

You do not have to assign a separate subnet per sub-interface .if you're using a Class A network (10.x.x.x/8), you blow the whole network on a few connections (if you used VLSM, you could use a better mask, limit the addresses used). if you used 10.0.0.0/8, you would not be assigning the entire /8 to a single network. You would select a subnet mask for the network and then, you would have to use that mask with all subnets of the network. So if you chose a /24 mask, that would mean that you would have to use a /24 mask for even point-to-point links. 


Q18. - (Topic 1) 

Refer to the exhibit. 

Why has this switch not been elected the root bridge for VLAN1? 

A. It has more than one interface that is connected to the root network segment. 

B. It is running RSTP while the elected root bridge is running 802.1d spanning tree. 

C. It has a higher MAC address than the elected root bridge. 

D. It has a higher bridge ID than the elected root bridge. 

Answer:

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a008009482f.s html When a switch receives a BPDU, it first compares priority, the lower number wins. If a tie, compare MAC, the smaller one wins. Here Switch has 32769 priority which is greater than 20481 so switch will not elect for root bridge. It says the bridge priority for Switch is 32769, and the root priority is 20481. Which means that some other switch has the lower priority and won the election for VLAN 1. 


Q19. DRAG DROP - (Topic 3) 

Answer: 

Explanation: 

1) a router is this type of device: DTE2) the most common type of virtual circuit: PVC3) provides status messages between DTE and DCE devices: LMI4) identifies the virtual connection between the DTE and the switch: DLCI 

CCNA Certification Test Prep Case Study http://www.thebryantadvantage.com/CCNACertificationExamTutorialDirectlyConnectedSeri alInterfaces.htm Configuring the LMI Type on a Frame Relay Interface http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3 Frame Relay DLCIs And Mappings http://www.mcmcse.com/cisco/guides/frame_relay_dlci.shtml 


Q20. - (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