Surprising ccna routing and switching 200 125 pdf

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New Cisco 200-125 Exam Dumps Collection (Question 10 - Question 19)

New Questions 10

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: B

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.


New Questions 11

Based on the network shown in the graphic

Which option contains both the potential networking problem and the protocol or setting that should be used to prevent the problem?

A. routing loops, hold down timers

B. switching loops, split horizon

C. routing loops, split horizon

D. switching loops, VTP

E. routing loops, STP

F. switching loops, STP

Answer: F

Explanation:

The Spanning-Tree Protocol (STP) prevents loops from being formed when switches or bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the 802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect loops, and then removes the loop by shutting down selected bridge interfaces. This algorithm guarantees that there is one and only one active path between two network devices.


New Questions 12

Why do large OSPF networks use a hierarchical design? (Choose three.)

A. to decrease latency by increasing bandwidth

B. to reduce routing overhead

C. to speed up convergence

D. to confine network instability to single areas of the network

E. to reduce the complexity of router configuration

F. to lower costs by replacing routers with distribution layer switches

Answer: B,C,D

Explanation:

OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. The hierarchical approach is used to achieve the following:

u2022Rapid convergence because of link and/or switch failures

u2022Deterministic traffic recovery

u2022Scalable and manageable routing hierarchy, reduced routing overhead.


New Questions 13

Refer to the exhibit.

The network administrator requires easy configuration options and minimal routing protocol traffic. What two options provide adequate routing table information for traffic that passes between the two routers and satisfy the requests of the network administrator? (Choose two.)

A. a dynamic routing protocol on InternetRouter to advertise all routes to CentralRouter.

B. a dynamic routing protocol on InternetRouter to advertise summarized routes to CentralRouter.

C. a static route on InternetRouter to direct traffic that is destined for 172.16.0.0/16 to CentralRouter.

D. a dynamic routing protocol on CentralRouter to advertise all routes to InternetRouter.

E. a dynamic routing protocol on CentralRouter to advertise summarized routes to InternetRouter.

F. a static, default route on CentralRouter that directs traffic to InternetRouter.

Answer: C,F

Explanation:

The use of static routes will provide the necessary information for connectivity while producing no routing traffic overhead.


New Questions 14

What is the purpose of Inverse ARP?

A. to map a known IP address to a MAC address

B. to map a known DLCI to a MAC address

C. to map a known MAC address to an IP address

D. to map a known DLCI to an IP address

E. to map a known IP address to a SPID

F. to map a known SPID to a MAC address

Answer: D

Explanation:

Dynamic address mapping relies on the Frame Relay Inverse Address Resolution Protocol (Inverse ARP), defined by RFC 1293, to resolve a next hop network protocol (IP) address to a local DLCI value. The Frame Relay router sends out Inverse ARP requests on its Frame Relay PVC to discover the protocol address of the remote device connected to the Frame Relay network. The responses to the Inverse ARP requests are used to populate an address-to-DLCI mapping table on the Frame Relay router or access server. The router builds and maintains this address-to-DLCI mapping table, which contains all resolved Inverse ARP requests, including both dynamic and static mapping entries.


New Questions 15

Refer to the exhibit.

Which two statements are true of the interfaces on Switch1? (Choose two.)

A. Multiple devices are connected directly to FastEthernet0/1.

B. A hub is connected directly to FastEthernet0/5.

C. FastEthernet0/1 is connected to a host with multiple network interface cards.

D. FastEthernet0/5 has statically assigned MAC addresses.

E. FastEthernet0/1 is configured as a trunk link.

F. Interface FastEthernet0/2 has been disabled.

Answer: B,E

Explanation:

Carefully observe the information given after command show. Fa0/1 is connected to Switch2, seven MAC addresses correspond to Fa0/1, and these MAC are in different VLAN. From this we know that Fa0/1 is the trunk interface.

From the information given by show cdp neighbors we find that there is no Fa0/5 in CDP neighbor. However, F0/5 corresponds to two MAC addresses in the same VLAN. Thus we know that Fa0/5 is connected to a Hub.

Based on the output shown, there are multiple MAC addresses from different VLANs attached to the FastEthernet 0/1 interface. Only trunks are able to pass information from devices in multiple VLANs.


New Questions 16

What two things will a router do when running a distance vector routing protocol? (Choose two.)

A. Send periodic updates regardless of topology changes.

B. Send entire routing table to all routers in the routing domain.

C. Use the shortest-path algorithm to the determine best path.

D. Update the routing table based on updates from their neighbors.

E. Maintain the topology of the entire network in its database.

Answer: A,D

Explanation:

Distance means how far and Vector means in which direction. Distance Vector routing protocols pass periodic copies of routing table to neighbor routers and accumulate distance vectors. In distance vector routing protocols, routers discover the best path to destination from each neighbor. The routing updates proceed step by step from router to router.


New Questions 17

Which command shows your active Telnet connections?

A. show cdp neigbors

B. show session

C. show users

D. show vty logins

Answer: B

Explanation:

The u201cshow usersu201d shows telnet/ssh connections to your router while u201cshow sessionsu201d shows telnet/ssh connections from your router (to other devices). The question asks about u201cyour active Telnet connectionsu201d, meaning connections from your router so the answer should be A.


New Questions 18

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

Explanation:

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.

STP (802.1D) Port State RSTP (802.1w) Port State

Is Port Included in Active Topology? Is Port Learning MAC Addresses? Disabled

Discarding No

No Blocking

Discarding No

No Listening Discarding Yes

No Learning Learning Yes

Yes Forwarding Forwarding Yes

Yes

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

a.shtml#states


New Questions 19

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

A. Router(config-if)# ppp authentication chap fallback ppp

B. Router(config-if)# ppp authentication chap pap

C. Router(config-if)# authentication ppp chap fallback ppp

D. Router(config-if)# authentication ppp chap pap

Answer: B

Explanation:

This command tells the router first to use CHAP and then go to PAP if CHAP isn't available.


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