Testking offers free demo for 105 200 exam. "Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0)", also known as ccna routing and switching icnd2 200 105 official cert guide exam, is a Cisco Certification. This set of posts, Passing the Cisco 200 105 icnd2 exam, will help you answer those questions. The icnd2 200 105 Questions & Answers covers all the knowledge points of the real exam. 100% real Cisco 200 105 icnd2 exams and revised by experts!


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Q31. - (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. 


Q32. - (Topic 2) 

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.) 

A. hello packets 

B. SAP messages sent by other routers 

C. LSAs from other routers 

D. beacons received on point-to-point links 

E. routing tables received from other link-state routers 

F. TTL packets from designated routers 

Answer: A,C 

Explanation: 

Link State Routing Protocols http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4 

Link state protocols, sometimes called shortest path first or distributed database protocols, are built around a well-known algorithm from graph theory, E. W. Dijkstra'a shortest path algorithm. Examples of link state routing protocols are: Open Shortest Path First (OSPF) for IP The ISO's Intermediate System to Intermediate System (IS-IS) for CLNS and IP DEC's DNA Phase V Novell's NetWare Link Services Protocol (NLSP) Although link state protocols are rightly considered more complex than distance vector protocols, the basic functionality is not complex at all: 

1. Each router establishes a relationship—an adjacency—with each of its neighbors. 

2. Each router sends link state advertisements (LSAs), some 

3. Each router stores a copy of all the LSAs it has seen in a database. If all works well, the databases in all routers should be identical. 

4. The completed topological database, also called the link state database, describes a graph of the internetwork. Using the Dijkstra algorithm, each router calculates the shortest path to each network and enters this information into the route table. 


Q33. - (Topic 1) 

Which three statements about RSTP are true? (Choose three.) 

A. RSTP significantly reduces topology reconverging time after a link failure. 

B. RSTP expands the STP port roles by adding the alternate and backup roles. 

C. RSTP port states are blocking, discarding, learning, or forwarding. 

D. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does. 

E. RSTP also uses the STP proposal-agreement sequence. 

F. RSTP uses the same timer-based process as STP on point-to-point links. 

Answer: A,B,D 

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf 

a.shtml 

Convergence 

Cisco enhanced the original 802.1D specification with features such as Uplink Fast, 

Backbone Fast, and Port Fast to speed up the convergence time of a bridged network. The 

drawback is that these mechanisms are proprietary and need additional configuration. 

Alternate and Backup Port Roles 

These two port roles correspond to the blocking state of 802.1D. A blocked port is defined 

as not being the designated or root port. A blocked port receives a more useful BPDU than 

the one it sends out on its segment. 

Remember that a port absolutely needs to receive BPDUs in order to stay blocked. RSTP 

introduces these two roles for this purpose. 

Rapid Transition to Forwarding State 

Rapid transition is the most important feature introduced by 802.1w. The legacy STA 

passively waited for the network to converge before it turned a port into the forwarding 

state. The achievement of faster convergence was a matter of tuning the conservative 

default parameters (forward delay and max_age timers) and often put the stability of the 

network at stake. The new rapid STP is able to actively confirm that a port can safely 

transition to the forwarding state without having to rely on any timer configuration. There is 

now a real feedback mechanism that takes place between RSTP-compliant bridges. In order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type. 


Q34. - (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# 


Q35. - (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. 


Q36. - (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 


Q37. - (Topic 2) 

Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.) 

A. Router(config)# router ospf 0 

B. Router(config)# router ospf 1 

C. Router(config)# router ospf area 0 

D. Router(config-router)# network 192.168.16.0 0.0.0.255 0 

E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0 

F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0 

Answer: B,E 

Explanation: 

In the router ospf Command, the ranges from 1 to 65535 so o is an invalid number - B is correct but A is not correct. To configure OSPF, we need a wildcard in the “network” statement, not a subnet mask. We also need to assign an area to this process - E is correct. 


Q38. - (Topic 3) 

What is the result of issuing the frame-relay map ip 192.168.1.2 202 broadcast command? 

A. defines the destination IP address that is used in all broadcast packets on DCLI 202 

B. defines the source IP address that is used in all broadcast packets on DCLI 202 

C. defines the DLCI on which packets from the 192.168.1.2 IP address are received 

D. defines the DLCI that is used for all packets that are sent to the 192.168.1.2 IP address 

Answer:

Explanation: 

Frame-relay map ip 192.168.1.2 202 command statically defines a mapping between a network layer address and a DLCI. The broadcast option allows multicast and broadcast packets to flow across the link. The command frame-relay map ip 192.168.1.2 202 broadcast means to mapping the distal IP 192.168.1.2 202 to the local DLCI . When the “broadcast” keyword is included, it turns Frame Relay network as a broadcast network, which can forward broadcasts. http://www.cisco.com/en/US/docs/ios/wan/command/reference/wan_f2.html#wp1012264 


Q39. - (Topic 3) 

In the Frame Relay network, 

which IP addresses would be assigned to the interfaces with point-to-point PVCs? 

A. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.10.3/24 

B. DLCI 16 192.168.10.1 /24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.12.1/24 DLCI 28 192.168.13.1/24 

C. DLCI 16 192.168.10.1/24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.11.2/24 

D. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.2/24 DLCI 99 192.168.10.3/24 DLCI 28 192.168.10.4/24 

Answer:

Explanation: 

DLCI 16 and DLCI 19 need to act like a point-to-point link and will therefore need to be on the same network as will DLCI 17 and DLCI 28. With this information we can see that option "B" is the only option that has the corresponding DLCI's on the same network based on the ip addresses and subnetmask. Option "D" is incorrect because, this would put the same network on both interfaces of the R2 router. Option "A" is similar. 


Q40. - (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.