Where to find ccna 200 105

The article at Testaimer.com going over http://www.testaimer.com/200-105-test is very comprehensive.

Q51. - (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. 



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

Neighbor ID Pri State Dead Time Address Interface 1 EXSTART/ - 00:00:33 Serial0.6 

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

Q52. - (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 



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. 

Q53. - (Topic 2) 

A router receives information about network from multiple sources. What will the router consider the most reliable information about the path to that network? 

A. an OSPF update for network 

B. a static route to network 

C. a static route to network with a local serial interface configured as the next hop 

D. a RIP update for network 

E. a directly connected interface with an address of 

F. a default route with a next hop address of 



What Is Administrative Distance? http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml 

Select the Best Path Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. Administrative distance has only local significance, and is not advertised in routing updates. Note: The smaller the administrative distance value, the more reliable the protocol. For example, if a router receives a route to a certain network from both Open Shortest Path First (OSPF) (default administrative distance - 110) and Interior Gateway Routing Protocol (IGRP) (default administrative distance - 100), the router chooses IGRP because IGRP is more reliable. This means the router adds the IGRP version of the route to the routing table. 

Q54. - (Topic 3) 

Refer to the exhibit. 

A technician pastes the configurations in the exhibit into the two new routers shown. Otherwise, the routers are configured with their default configurations. A ping from Host1 to Host2 fails, but the technician is able to ping the S0/0 interface of R2 from Host1. The configurations of the hosts have been verified as correct. What is the cause of the problem? 

A. The serial cable on R1 needs to be replaced. 

B. The interfaces on R2 are not configured properly. 

C. R1 has no route to the network. 

D. The IP addressing scheme has overlapping subnetworks. 

E. The ip subnet-zero command must be configured on both routers. 



Whenever a node needs to send data to another node on a network, it must first know where to send it. If the node cannot directly connect to the destination node, it has to send it via other nodes along a proper route to the destination node. A remote network is a network that can only be reached by sending the packet to another router. Remote networks are added to the routing table using either a dynamic routing protocol or by configuring static routes. Static routes are routes to networks that a network administrator manually configured.So R should have static route for the 

Q55. - (Topic 3) 

Which two options are valid WAN connectivity methods? (Choose two.) 




D. L2TPv3 

E. Ethernet 

Answer: A,C 


On each WAN connection, data is encapsulated into frames before itcrosses the WAN link. The following are typical WAN protocols:1. High-level Data Link Control (HDLC): The Cisco default encapsulation type onpoint-to-point connections, dedicated links, and circuit-switches connections.2. PPP: Provides router-to-router and host-to-network connections over synchronous andasynchronous circuits. PPP was designed to work with several network layer protocols,including IP.3. Frame-relay: A successor to X.25. This protocol is an industry-standard, switchesdata-link layer protocol that handles multiple virtual circuits 


Q56. - (Topic 1) 

Which two states are the port states when RSTP has converged? (Choose two.) 

A. discarding 

B. listening 

C. learning 

D. forwarding 

E. disabled 

Answer: A,D 


Understanding Rapid Spanning Tree Protocol (802.1w) 

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

Port States There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state. RSTP only has 3 port states which are discarding, learning and forwarding. When RSTP has converged there are only 2 port states left: discarding and forwarding. 

Q57. - (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 


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. 

Q58. - (Topic 3) 

A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection? 

A. Main(config)# interface serial 0/0 Main(config-if)# ip address Main(config-if)# no shut 

B. Main(config)# interface serial 0/0 Main(config-if)# ip address Main(config-if)# encapsulation ppp Main(config-if)# no shut 

C. Main(config)# interface serial 0/0 Main(config-if)# ip address Main(config-if)# encapsulation frame-relay Main(config-if)# authentication chap Main(config-if)# no shut 

D. Main(config)# interface serial 0/0 Main(config-if)#ip address Main(config-if)#encapsulation ietf Main(config-if)# no shut 



Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links using HDLC. So HDLC runs only in Cisco router. PPP is not proprietary protocol it's a open source every cisco router and non-cisco router understand the PPP protocol.So we need to configure the PPP protocol if connection is between cisco and non-cisco router. 

Q59. - (Topic 2) 

Which two statements describe the process identifier that is used in the command to configure OSPF on a router? (Choose two.) 

Router(config)# router ospf 1 

A. All OSPF routers in an area must have the same process ID. 

B. Only one process number can be used on the same router. 

C. Different process identifiers can be used to run multiple OSPF processes 

D. The process number can be any number from 1 to 65,535. 

E. Hello packets are sent to each neighbor to determine the processor identifier. 

Answer: C,D 


The areas can be any number from 0 to 4.2 billion and 1 to 65,535 for the Process ID. The process ID is the ID of the OSPF process to which the interface belongs. The process ID is local to the router, and two OSPF neighboring routers can have different OSPF process IDs. (This is not true of Enhanced Interior Gateway Routing Protocol [EIGRP], in which the routers need to be in the same autonomous system). Cisco IOS Software can run multiple OSPF processes on the same router, and the process ID merely distinguishes one process from the other. The process ID should be a positive integer. 

Q60. - (Topic 3) 

What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.) 

A. They create split-horizon issues. 

B. They require a unique subnet within a routing domain. 

C. They emulate leased lines. 

D. They are ideal for full-mesh topologies. 

E. They require the use of NBMA options when using OSPF. 

Answer: B,C 

Explanation: http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=5 

Configuring Frame Relay Subinterfaces On partially meshed Frame Relay networks, the problem of split horizon can be overcome by using Frame Relay subinterfaces. Frame Relay provides a mechanism to allow a physical interface to be partitioned into multiple virtual interfaces. In a similar way, using subinterfaces allows a partially meshed network to be divided into a number of smaller, fully meshed point-to-point networks. Generally, each point-to-point subnetwork is assigned a unique network address. This allows packets received on one physical interface to be sent out from the same physical interface, albeit forwarded on VCs in different subinterfaces. There are two types of subinterfaces supported by Cisco routers: point-to-point and multipoint subinterfaces.