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October 11, 2017

Questions Ask for cisco 200 105

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Q1. - (Topic 3) 

Which two statements about using the CHAP authentication mechanism in a PPP link are true? (Choose two.) 

A. CHAP uses a two-way handshake. 

B. CHAP uses a three-way handshake. 

C. CHAP authentication periodically occurs after link establishment. 

D. CHAP authentication passwords are sent in plaintext. 

E. CHAP authentication is performed only upon link establishment. 

F. CHAP has no protection from playback attacks. 

Answer: B,C 

Explanation: 

Understanding and Configuring PPP CHAP Authentication http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a00800b4131. shtml 

One-Way and Two-Way Authentication CHAP is defined as a one-way authentication method. However, you use CHAP in both directions to create a two-way authentication. Hence, with two-way CHAP, a separate three-way handshake is initiated by each side. In the Cisco CHAP implementation, by default, the called party must authenticate the calling party (unless authentication is completely turned off). Therefore, a one-way authentication initiated by the called party is the minimum possible authentication. However, the calling party can also verify the identity of the called party, and this results in a two-way authentication. One-way authentication is often required when you connect to non-Cisco devices. 


Q2. - (Topic 1) 

What is one benefit of PVST+? 

A. PVST+ supports Layer 3 load balancing without loops. 

B. PVST+ reduces the CPU cycles for all the switches in the network. 

C. PVST+ allows the root switch location to be optimized per VLAN. 

D. PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage. 

Answer:

Explanation: 

Per VLAN Spanning Tree (PVST) Introduction http://www.cisco.com/en/US/tech/tk389/tk621/tk846/tsd_technology_support_sub-protocol_home.html Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. This means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic. http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=4 

Topic 2, Routing Technologies 


Q3. - (Topic 2) 

Which statement describes the process ID that is used to run OSPF on a router? 

A. It is globally significant and is used to represent the AS number. 

B. It is locally significant and is used to identify an instance of the OSPF database. 

C. It is globally significant and is used to identify OSPF stub areas. 

D. It is locally significant and must be the same throughout an area. 

Answer:

Explanation: The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion. 


Q4. - (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 


Q5. - (Topic 2) 

Refer to the exhibit. 

Based on the exhibited routing table, how will packets from a host within the 192.168.10.192/26 LAN be forwarded to 192.168.10.1? 

A. The router will forward packets from R3 to R2 to R1. 

B. The router will forward packets from R3 to R1 to R2. 

C. The router will forward packets from R3 to R2 to R1 AND from R3 to R1. 

D. The router will forward packets from R3 to R1. 

Answer:

Explanation: 

From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal- cost paths (192.168.10.9 &192.168.10.5) - traffic to this network will be load-balanced. 


Q6. - (Topic 2) 

Refer to the exhibit. 

A packet with a source IP address of 192.168.2.4 and a destination IP address of 10.1.1.4 arrives at the AcmeB router. What action does the router take? 

A. forwards the received packet out the Serial0/0 interface 

B. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface 

C. forwards a packet containing an ICMP message out the FastEthemet0/0 interface 

D. forwards a packet containing an ARP request out the FastEthemet0/1 interface 

Answer: C Explanation: 

CCNA - EIGRP Common Question http://www.orbitco-ccna-pastquestions.com/CCNA---EIGRP-Common-Question.php 

Looking at the output above, there is no IP route for 10.1.1.4 address on AcmeB routing table. If the router can no find a specific path in its routing table to a particular route,( In this case no path is found so AcmeB) the router will inform the source host with an ICMP message that the destination is unreachable and this will be through the same interface it has received the packet (interface Fa0/0 network 192.168.3.0/28 from the exhibit). 

Topic 3, WAN Technologies 


Q7. - (Topic 2) 

Refer to the exhibit. 

What information about the interfaces on the Main_Campus router is true? 

A. The LAN interfaces are configured on different subnets. 

B. Interface FastEthernet 0/0 is configured as a trunk. 

C. The Layer 2 protocol of interface Serial 0/1 is NOT operational. 

D. The router is a modular router with five FastEthernet interfaces. 

E. Interface FastEthernet 0/0 is administratively deactivated. 

Answer:

Explanation: 

Interface fa0/0 breaks into sub-interfaces and Main_Campus router is connected with switch via fa0/0 .Subinterfaces configured with different subnet masks so the same switch has multiple vlans and allows communication between these VLAN's. For routing and inter-vlan we need to configure a trunk port. So B will be the correct answer. 


Q8. 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 


Q9. - (Topic 3) 

Which feature does PPP use to encapsulate multiple protocols? 

A. NCP 

B. LCP 

C. IPCP 

D. IPXP 

Answer:

Explanation: 

PPP permits multiple network layer protocols to operate on the same communication link. For every network layer protocol used, a separate Network Control Protocol (NCP) is provided in order to encapsulate and negotiate options for the multiple network layer protocols. It negotiates network-layer information, e.g. network address or compression options, after the connection has been established 


Q10. - (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. 



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