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Q21. - (Topic 1) 

Refer to the exhibit. 

Which two statements are true about interVLAN routing in the topology that is shown in the exhibit? (Choose two.) 

A. Host E and host F use the same IP gateway address. 

B. Router1 and Switch2 should be connected via a crossover cable. 

C. Router1 will not play a role in communications between host A and host D. 

D. The FastEthernet 0/0 interface on Router1 must be configured with subinterfaces. 

E. Router1 needs more LAN interfaces to accommodate the VLANs that are shown in the exhibit. 

F. The FastEthernet 0/0 interface on Router1 and the FastEthernet 0/1 interface on Switch2 trunk ports must be configured using the same encapsulation type. 

Answer: D,F 

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml 


Q22. - (Topic 2) 

Refer to the exhibit. 

Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit? 

A. Router R2 will not form a neighbor relationship with R1. 

B. Router R2 will obtain a full routing table, including a default route, from R1. 

C. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1. 

D. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1. 

Answer:

Explanation: 

Open Shortest Path First http://en.wikipedia.org/wiki/Open_Shortest_Path_First 

The configuration of R1 shows "router ospf 1" however, the diagram also shows that both routers should be in the backbone OSPF Area of "0". When routers are in different OSPF areas they will not form a neighbor relationship. Neighbor relationships As a link state routing protocol, OSPF establishes and maintains neighbor relationships in order to exchange routing updates with other routers. The neighbor relationship table is called an adjacency database in OSPF. Provided that OSPF is configured correctly, OSPF forms neighbor relationships only with the routers directly connected to it. In order to form a neighbor relationship between two routers, the interfaces used to form the relationship must be in the same area. Generally an interface is only configured in a single area, however you can configure an interface to belong to multiple areas. In the second area, such an interface must be configured as a secondary interface. (A neighbor state simulation shows how neighbor state changes from Down to Full Adjacency progressively with exchanging Hello, DD, Request, Update, and Ack packets). 


Q23. - (Topic 3) 

Refer to the exhibit. 

The show interfaces serial 0/1 command was issued on the R10-1 router. Based on the output displayed which statement is correct? 

A. The cable connected to the serial 0/1 interface of the R10-1 router is a DTE cable. 

B. The R10-1 router can ping the router interface connected to the serial 0/1 interface. 

C. The clock rate used for interface serial 0/1 of the R10-1 router is 1,544,000 bits per second. 

D. The CSU used with the serial 0/1 interface of the R10-1 router has lost connection to the service provider. 

E. The interface of the remote router connected to the serial 0/1 interface of the R10-1 router is using the default serial interface encapsulation. 

Answer:

Explanation: 

Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for Cisco HDLC is the default encapsulation type for the serial interfaces. 


Q24. - (Topic 2) 

Refer to the exhibit. 

C-router is to be used as a "router-on-a-stick" to route between the VLANs. All the interfaces have been properly configured and IP routing is operational. The hosts in the VLANs have been configured with the appropriate default gateway. What is true about this configuration? 

A. These commands need to be added to the configuration: C-router(config)# router eigrp 123 C-router(config-router)# network 172.19.0.0 

B. These commands need to be added to the configuration: C-router(config)# router ospf 1 C-router(config-router)# network 172.19.0.0 0.0.3.255 area 0 

C. These commands need to be added to the configuration: C-router(config)# router rip C-router(config-router)# network 172.19.0.0 

D. No further routing configuration is required. 

Answer:

Explanation: 

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml https://learningnetwork.cisco.com/servlet/JiveServlet/download/5669-2461/Router%20on%20a%20Stick.pdf. 


Q25. - (Topic 2) 

Refer to the exhibit. 

If the router R1 returns the given output and has not had its router ID set manually, what address will EIGRP use as its router ID? 

A. 192.168.1.2 

B. 172.16.4.1 

C. 192.168.10.2 

D. 1.1.1.1 

Answer:

Explanation: 

The router ID is selected according to the following rules: manual configuration highest up/up loopback highest up/up physical interface 


Q26. - (Topic 3) 

Refer to the exhibit. 

What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown? 

A. The Serial0/0 interface is passing traffic. 

B. The DLCI 100 was dynamically allocated by the router 

C. The Serial0/0 interface acquired the IP address of 172.16.3.1 from a DHCP server 

D. The DLCI 100 will be dynamically changed as required to adapt to changes in the Frame Relay cloud 

E. The mapping between DLCI 100 and the end station IP address 172.16.3.1 was learned through Inverse ARP 

Answer:

Explanation: 

The term dynamic indicates that the DLCI number and the remote router IP address 

172.16.3.1 are learned via the Inverse ARP process. 

Inverse ARP is a technique by which dynamic mappings are constructed in a network, allowing a device such as a router to locate the logical network address and associate it with a permanent virtual circuit (PVC). 


Q27. - (Topic 2) 

Which two statements about the OSPF Router ID are true? (Choose two.) 

A. It identifies the source of a Type 1 LSA. 

B. It should be the same on all routers in an OSPF routing instance. 

C. By default, the lowest IP address on the router becomes the OSPF Router ID. 

D. The router automatically chooses the IP address of a loopback as the OSPF Router ID. 

E. It is created using the MAC Address of the loopback interface. 

Answer: A,D 

Explanation: 

From the output of the “show ip ospf database”: r120#show ip ospf data 

OSPF Router with ID (10.0.0.120) (Process ID 1) 

Next, who are the other routers in our area? Router Link States (Area 1) Link ID.ADV Router.Age.Seq#.Checksum Link count 

10.0.0.111.10.0.0.111.600.0x8000023A 0x0092B3 1 

10.0.0.112.10.0.0.112.1246.0x80000234 0x009CAC 1 

10.0.0.113.10.0.0.113.148.0x8000022C 0x004399 3 

10.0.0.120.10.0.0.120.152.0x80000240 0x0046CB 1 This tells us there are four routers in Area 1. The router with RID 10.0.0.113 has 3 links in Area 1, every one else has only 1 link. Also the router will chose the highest loopback interface as its OSPF router ID (if available). 


Q28. - (Topic 3) 

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers? 

A. IETF 

B. ANSI Annex D 

C. Q9333-A Annex A 

D. HDLC 

Answer:

Explanation: Cisco supports two Frame Relay encapsulation types: the Cisco encapsulation and the IETF Frame Relay encapsulation, which is in conformance with RFC 1490 and RFC 2427. The former is often used to connect two Cisco routers while the latter is used to connect a Cisco router to a non-Cisco router. You can test with your Cisco router when typing the command Router(config-if)#encapsulation frame-relay ? on a WAN link. Note: Three LMI options are supported by Cisco routers are ansi, Cisco, and Q933a. They represent the ANSI Annex D, Cisco, and ITU Q933-A (Annex A) LMI types, respectively. HDLC is a WAN protocol same as Frame-Relay and PPP so it is not a Frame Relay encapsulation type. 


Q29. - (Topic 2) 

What is the default administrative distance of OSPF? 

A. 90 

B. 100 

C. 110 

D. 120 

Answer:

Explanation: 

Default Distance Value Table This table lists the administrative distance default values of the protocols that Cisco supports: 


Q30. - (Topic 2) 

Refer to the exhibit. 

RTA is configured with a basic configuration. The link between the two routers is operational and no routing protocols are configured on either router. The line shown in the exhibit is then added to router RTA. Should interface Fa0/0 on router RTB shut down, what effect will the shutdown have on router RTA? 

A. A route to 172.16.14.0/24 will remain in the RTA routing table. 

B. A packet to host 172.16.14.225 will be dropped by router RTA. 

C. Router RTA will send an ICMP packet to attempt to verify the route. 

D. Because router RTB will send a poison reverse packet to router RTA, RTA will remove the route. 

Answer:

Explanation: 

Static routes remain in the routing table even if the specified gateway becomes unavailable. If the specified gateway becomes unavailable, you need to remove the static route from the routing table manually. However, static routes are removed from the routing table if the specified interface goes down, and are reinstated when the interface comes back up. Therefore the static route will only be removed from the routing table if the S0/0 interface on RTA is shutdown. 

Reference: http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/route_static.html)