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Q21. – (Topic 1) 

Refer to the exhibit 

Which switch provides the spanning-tree designated port role for the network segment that services the printers? 

A. Switch1 

B. Switch2 

C. Switch3 

D. Switch4 

Answer:

Explanation: 

First, the question asks what switch services the printers, so it can be Switch 3 or Switch 4 

which is connected directly to the Printers. 

Designated port is a port that is in the forwarding state. All ports of the root bridge are 

designated ports. 

Switch 3 and Switch 4 has same priority so it will see on lowest MAC address and here 

switch 3 has lowest MAC address. So switch 3 segment will play a Designated port role. 

By comparing the MAC address of Switch 3 and Switch 4 we found that the MAC of Switch 

3 is smaller. Therefore the interface connected to the Printers of Switch 3 will become 

designated interface and the interface of Switch 4 will be blocked. 

Q22. – (Topic 2) 

What is the default maximum number of equal-cost paths that can be placed into the routing table of a Cisco OSPF router? 

A. 2 

B. 4 

C. 16 

D. unlimited 

Answer:

Explanation: 

4 is the default number of routes that OSPF will include in routing table if more than 4 equal cost routes exist for the same subnet. However, OSPF can include up to 16 equal cost routes in the routing table and perform load balancing amongst them. In order to configure this feature, you need to use the OSPF subcommand maximum-paths, i.e. maximum-paths 16. 

Q23. – (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 

Q24. – (Topic 3) 

Refer to the exhibit. 

Which WAN protocol is being used? 

A. ATM 

B. HDLC 

C. Frame Relay 

D. PPP 

Answer:

Explanation: 

"Show interface pos8/0/0" command showing LMI enq sent which show frame-relay encapsulation enabled on this interface. Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3 

Q25. – (Topic 2) 

Refer to the exhibit. 

Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router? 

A. 10.1.1.2 

B. 10.154.154.1 

C. 172.16.5.1 

D. 192.168.5.3 

Answer:

Explanation: 

CCNA Tutorial: The OSPF Router ID (RID) http://www.thebryantadvantage.com/CCNACertificationExamTutorialOSPFRouterIDRID.ht m 

When determining the Router ID (RID) of an OSPF-enabled router, OSPF will always use the numerically highest IP address on the router’s loopback interfaces, regardless of whether that loopback is OSPF-enabled. 

What if there is no loopback? OSPF will then use the numerically highest IP address of the physical interfaces, regardless of whether that interface is OSPF-enabled. 

Q26. – (Topic 2) 

Refer to the exhibit. 

The Lakeside Company has the internetwork in the exhibit. The administrator would like to reduce the size of the routing table on the Central router. Which partial routing table entry in the Central router represents a route summary that represents the LANs in Phoenix but no additional subnets? 

A. 10.0.0.0/22 is subnetted, 1 subnets D 10.0.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

B. 10.0.0.0/28 is subnetted, 1 subnets D 10.2.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

C. 10.0.0.0/30 is subnetted, 1 subnets D 10.2.2.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

D. 10.0.0.0/22 is subnetted, 1 subnets D 10.4.0.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

E. 10.0.0.0/28 is subnetted, 1 subnets D 10.4.4.0 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

F. 10.0.0.0/30 is subnetted, 1 subnets D 10.4.4.4 [90/20514560] via 10.2.0.2, 6w0d, Serial0/1 

Answer:

Explanation: 

All the above networks can be summarized to 10.0.0.0 network but the question requires to “represent the LANs in Phoenix but no additional subnets” so we must summarized to 

10.4.0.0 network. The Phoenix router has 4 subnets so we need to “move left” 2 bits of “/24-> /22 is the best choice – D is correct. 

Q27. – (Topic 1) 

Which three of these statements regarding 802.1Q trunking are correct? (Choose three.) 

A. 802.1Q native VLAN frames are untagged by default. 

B. 802.1Q trunking ports can also be secure ports. 

C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces. 

D. 802.1Q trunks require full-duplex, point-to-point connectivity. 

E. 802.1Q trunks should have native VLANs that are the same at both ends. 

Answer: A,C,E 

Explanation: 

CCNA Self-Study (ICND Exam): Extending Switched Networks with Virtual LANs http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=2 

Q28. – (Topic 2) 

Refer to the exhibit. 

The network is converged. After link-state advertisements are received from Router_A, what information will Router_E contain in its routing table for the subnets 208.149.23.64 and 208.149.23.96? 

A. O 208.149.23.64 [110/13] via 190.173.23.10, 00:00:07, FastEthernet 0/0 O 208.149.23.96 [110/13] via 190.173.23.10, 00:00:16, FastEthernet 0/0 

B. O 208.149.23.64 [110/1] via 190.172.23.10, 00:00:07, Serial 1/0 O 208.149.23.96 [110/3] via 190.173.23.10, 00:00:16, FastEthernet 0/0 

C. O 208.149.23.64 [110/13] via 190.172.23.10, 00:00:07, Serial 1/0 O 208.149.23.96 [110/13] via 190.172.23.10, 00:00:16, Serial 1/0 O 208.149.23.96 [110/13] via 190.173.23.10, 00:00:16, FastEthernet 0/0 

D. O 208.149.23.64 [110/3] via 190.172.23.10, 00:00:07, Serial 1/0 O 208.149.23.96 [110/3] via 190.172.23.10, 00:00:16, Serial 1/0 

Answer:

Explanation: 

Router_E learns two subnets subnets 208.149.23.64 and 208.149.23.96 via Router_A through FastEthernet interface. The interface cost is calculated with the formula 108 / 

Bandwidth. For FastEthernet it is 108 / 100 Mbps = 108 / 100,000,000 = 1. Therefore the cost is 12 (learned from Router_A) + 1 = 13 for both subnets – B is not correct. 

The cost through T1 link is much higher than through T3 link (T1 cost = 108 / 1.544 Mbps = 

64; T3 cost = 108 / 45 Mbps = 2) so surely OSPF will choose the path through T3 link -> 

Router_E will choose the path from Router_A through FastEthernet0/0, not Serial1/0 – C & 

D are not correct. 

In fact, we can quickly eliminate answers B, C and D because they contain at least one subnet learned from Serial1/0 – they are surely incorrect. 

Q29. – (Topic 1) 

Refer to the exhibit. 

Each of these four switches has been configured with a hostname, as well as being configured to run RSTP. No other configuration changes have been made. Which three of these show the correct RSTP port roles for the indicated switches and interfaces? (Choose three.) 

A. SwitchA, Fa0/2, designated 

B. SwitchA, Fa0/1, root 

C. SwitchB, Gi0/2, root 

D. SwitchB, Gi0/1, designated 

E. SwitchC, Fa0/2, root 

F. SwitchD, Gi0/2, root 

Answer: A,B,F 

Explanation: 

The question says "no other configuration changes have been made" so we can 

understand these switches have the same bridge priority. SwitchC has lowest MAC 

address so, it will become root bridge and 2 of its ports (Fa0/1 & Fa0/2) will be designated 

ports (DP). Because SwitchC is the root bridge the 2 ports nearest SwitchC on SwitchA 

(Fa0/1) and SwitchD (Gi0/2) will be root ports (RP) -> B and F are correct. 

SwitchB must have a root port so which port will it choose? To answer this question we 

need to know about STP cost and port cost. 

In general, "cost" is calculated based on bandwidth of the link. The higher the bandwidth on 

a link, the lower the value of its cost. Below are the cost values you should memorize: 

Link speed Cost SwitchB will choose the interface with lower cost to the root bridge as the root port so we must calculate the cost on interface Gi0/1 & Gi0/2 of SwitchB to the root bridge. This can be calculated from the "cost to the root bridge" of each switch because a switch always advertises its cost to the root bridge in its BPDU. The receiving switch will add its local port cost value to the cost in the BPDU. SwitchC advertises its cost to the root bridge with a value of 0. Switch D adds 4 (the cost value of 1Gbps link) and advertises this value (4) to SwitchB. SwitchB adds another 4 and learns that it can reach SwitchC via Gi0/1 port with a total cost of 8. The same process happens for SwitchA and SwitchB learns that it can reach SwitchC via Gi0/2 with a total cost of 23 -> Switch B chooses Gi0/1 as its root port. Now our last task is to identify the port roles of the ports between SwitchA & SwitchB. It is rather easy as the MAC address of SwitchA is lower than that of SwitchB so Fa0/2 of SwitchA will be designated port while Gi0/2 of SwitchB will be alternative port. 

Q30. – (Topic 2) 

What can cause two OSPF neighbors to be stuck in the EXSTART state? 

A. There is a low bandwidth connection between neighbors. 

B. The neighbors have different MTU settings. 

C. The OSPF interfaces are in a passive state. 

D. There is only layer one connectivity between neighbors. 

Answer:

Explanation: 

Neighbors Stuck in Exstart/Exchange State The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor's router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don't match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.0 When this problem occurs, the output of the show ip ospf neighbor command displays output similar that shown below: router-6# show ip ospf neighbor 

Neighbor ID Pri State Dead Time Address Interface 

170.170.11.7 1 EXCHANGE/ – 00:00:36 170.170.11.7 Serial2.7 router-6# router-7# show ip ospf neighbor 

Neighbor ID Pri State Dead Time Address Interface 

170.170.11.6 1 EXSTART/ – 00:00:33 170.170.11.6 Serial0.6 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html 

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