[Free] Download New Updated (October 2016) Cisco 200-105 Real Exam 71-80

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QUESTION 71

What are two benefits of using a single OSPF area network design? (Choose two.)

 

A.

It is less CPU intensive for routers in the single area.

B.

It reduces the types of LSAs that are generated.

C.

It removes the need for virtual links.

D.

It increases LSA response times.

E.

It reduces the number of required OSPF neighbor adjacencies.

 

Correct Answer: BC

Explanation:

OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement).

The link types are as follows:

 

clip_image002LSA Type 1: Router LSA

clip_image002[1]LSA Type 2: Network LSA

clip_image002[2]LSA Type 3: Summary LSA

clip_image002[3]LSA Type 4: Summary ASBR LSA

clip_image002[4]LSA Type 5: Autonomous system external LSA

clip_image002[5]LSA Type 6: Multicast OSPF LSA

clip_image002[6]LSA Type 7: Not-so-stubby area LSA

clip_image002[7]LSA Type 8: External attribute LSA for BGP

 

If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router.

 

All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non- backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed.

 

 

QUESTION 72

When a router undergoes the exchange protocol within OSPF, in what order does it pass through each state?

 

A.

exstart state > loading state > exchange state > full state

B.

exstart state > exchange state > loading state > full state

C.

exstart state > full state > loading state > exchange state

D.

loading state > exchange state > full state > exstart state

 

Correct Answer: B

Explanation:

OSPF states for adjacency formation are (in order) Down, Init, Attempt, 2-way, Exstart, Exchange, Loading and Full.

 

Reference:

Why Are OSPF Neighbors Stuck in Exstart/Exchange State?

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0d.shtml

 

 

 

 

 

QUESTION 73

Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?

 

clip_image004

 

A.

Any packet destined for a network that is not directly connected to router R1 will be dropped.

B.

Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.

C.

Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1.

D.

The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks.

E.

Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.

 

Correct Answer:

Explanation:

First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128, 0.0.0.31) so the packets destined for these networks will not be affected by the default route. The default route configured on R1 “ip route 0.0.0.0 0.0.0.0 serial0/0 will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn’t drop anything so answers A, B and C are not correct. D is not correct too because these routes are declared in R1 and the question says that “OSPF has been correctly configured on router R2, so network directly connected to router R2 can communicate with those three subnetworks. As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur.

 

 

QUESTION 74

What OSPF command, when configured, will include all interfaces into area 0?

 

A.

network 0.0.0.0 255.255.255.255 area 0

B.

network 0.0.0.0 0.0.0.0 area 0

C.

network 255.255.255.255 0.0.0.0 area 0

D.

network all-interfaces area 0

 

Correct Answer: A

Explanation:

Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area 0. The network command network 0.0.0.0 255.255.255.255 area 0 dictates that you do not care (255.255.255.255) what the IP address is, but if an IP address is enabled on any interface, place it in area 0.

Example 3-1 Configuring OSPF in a Single Area

router ospf 1

network 0.0.0.0 255.255.255.255 area 0

Reference: http://www.ciscopress.com/articles/article.asp?p=26919&seqNum=3

 

 

QUESTION 75

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?

 

clip_image006

 

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

 

Correct 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).

 

 

QUESTION 76

Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

 

A.

HDLC

B.

PPP

C.

X.25

D.

Frame Relay

 

Correct Answer: B

Explanation:

High-Level Data Link Control (HDLC) – HDLC is the default encapsulation type on point-to- point, dedicated links, and circuit-switched connections. It is used typically when communicating between two Cisco devices. It is a bit-oriented synchronous data link layer protocol.

Point-to-Point Protocol (PPP) – Provides router-to-router and host-to network connections over synchronous and asynchronous circuits. PPP was designed to work with several network layer protocols, such as IP, and IPX. PPP also has built in security mechanisms such as PAP and CHAP X.25/Link Access Procedure, Balanced (LAPB) – ITU-T standard that defines how connections between DTE and DCE are maintained for remote terminal access and computer communications in public data networks. X.25 specifies LAPB, a data line layer protocol. X.25 is a predecessor to Frame Relay. Frame Relay – Industry standard, switched data link layer protocol that handles multiple virtual circuits. It is a next-generation to X.25 that is streamlined to eliminate some of the time-consuming processes (such as error correction and flow control) that were employed in X.25.

 

clip_image008

 

 

 

 

 

QUESTION 77

The command show frame-relay map gives the following output:

 

Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status defined, active

 

Which statements represent what is shown?(Choose three.)

 

A.

192.168.151.4 represents the IP address of the remote router

B.

192.168.151.4 represents the IP address of the local serial interface

C.

DLCI 122 represents the interface of the remote serial interface

D.

DLCI 122 represents the local number used to connect to the remote address

E.

broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC

F.

active indicates that the ARP process is working

 

Correct Answer: ADE

Explanation:

http://www.cisco.com/en/US/docs/ios/12_2/wan/command/reference/wrffr4.html#wp102934

 

clip_image009

 

 

QUESTION 78

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

 

A.

PPP

B.

WAP

C.

DSL

D.

L2TPv3

E.

Ethernet

 

Correct Answer: AC

Explanation:

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

 

http://en.wikipedia.org/wiki/Wide_area_network

 

 

QUESTION 79

Which PPP subprotocol negotiates authentication options?

 

A.

NCP

B.

ISDN

C.

SLIP

D.

LCP

E.

DLCI

 

Correct Answer: D

Explanation:

A protocol that establishes, configures, and tests data link connections used by the PPP Link Control Protocol offers PPP encapsulation different options, including the following:

Authentication – options includes PAP and CHAP Compression – Data compression increases the throughput on a network link, by reducing the amount of data that must be transmitted.

Error Detection – Quality and Magic numbers are used by PPP to ensure a reliable, loop-free data link.

Multilink – Supported in IOS 11.1 and later, multilink is supported on PPP links between Cisco routers. This splits the load for PPP over two or more parallel circuits and is called a bundle.

 

 

QUESTION 80

Refer to the exhibit. Which WAN protocol is being used?

 

clip_image011

 

A.

ATM

B.

HDLC

C.

Frame Relay

D.

PPP

 

Correct Answer: C

Explanation:

“Show interface pos8/0/0” command showing LMI enq sent which show frame-relay encapsulation enabled on this interface. Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A

http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3

 

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