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2021 Dec 200-105 book

Q11. - (Topic 3) 

It has become necessary to configure an existing serial interface to accept a second Frame Relay virtual circuit. Which of the following are required to solve this? (Choose three) 

A. configure static frame relay map entries for each subinterface network. 

B. remove the ip address from the physical interface 

C. create the virtual interfaces with the interface command 

D. configure each subinterface with its own IP address 

E. disable split horizon to prevent routing loops between the subinterface networks 

F. encapsulate the physical interface with multipoint PPP 

Answer: B,C,D 

Explanation: 

How To Configure Frame Relay Subinterfaces http://www.orbit-computer-solutions.com/How-To-Configure-Frame-Relay-Subinterfaces.php 

Step to configure Frame Relay subinterfaces on a physical interface: 

1. Remove any network layer address (IP) assigned to the physical interface. If the physical interface has an address, frames are not received by the local subinterfaces. 

2. Configure Frame Relay encapsulation on the physical interface using the encapsulation frame-relay command. 

3. For each of the defined PVCs, create a logical subinterface. Specify the port number, followed by a period (.) and the subinterface number. To make troubleshooting easier, it is suggested that the subinterface number matches the DLCI number. 

4. Configure an IP address for the interface and set the bandwidth. 

5. Configure the local DLCI on the subinterface using the frame-relay interface-dlci command. Configuration Example: R1>enable R1#configure terminal R1(config)#interface serial 0/0/0 R1(config-if)#no ip address R1(config-if)#encapsulation frame-relay R1(config-if)#no shutdown R1(config-if)#exit R1(config-subif)#interface serial 0/0/0.102 point-to-point R1(config-subif)#ip address 192.168.1.245 255.255.255.252 R1(config-subif)#frame-relay interface-dlci 102 R1(config-subif)#end R1#copy running-config startup-config 


Q12. - (Topic 3) 

Which two statistics appear in show frame-relay map output? (Choose two.) 

A. the number of BECN packets that are received by the router 

B. the value of the local DLCI 

C. the number of FECN packets that are received by the router 

D. the status of the PVC that is configured on the router 

E. the IP address of the local router 

Answer: B,D 

Explanation: 

Frame Relay Commands (map-class frame-relay through threshold ecn) 

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

Examples 

The following is sample output from the show frame-relay map command: 

Router#show frame-relay map Serial 1 (administratively down): ip 10.108.177.177 

dlci 177 (0xB1,0x2C10), static, broadcast, 

CISCO 

TCP/IP Header Compression (inherited), passive (inherited) 


Q13. - (Topic 2) 

What are the two default metrics used by EIGRP for route selection? (Choose two.) 

A. Bandwidth 

B. Delay 

C. Reliability 

D. Load 

E. MTU 

Answer: A,B 

Explanation: 

EIGRP adds together weighted values of different network link characteristics in order to calculate a metric for evaluating path selection. 

These characteristics include: 

. Delay (measured in 10s of microseconds) 

. Bandwidth (measured in kilobytes per second) 

. Reliability (in numbers ranging from 1 to 255; 255 being the most reliable) 

. Load (in numbers ranging from 1 to 255; 255 being saturated) 

Various constants (K.1.through K.5) are able to be set by a user to produce varying routing behaviors. However by default, only delay and bandwidth are used in the weighted formula to produce a single 32bit metric: 

Note:.Default K values are:.K1.=.K3.= 1 and.K2.=.K4.=.K5.= 0When K5.is equal to 0 then [ 

K5/(.K4.+ reliability)] is defined to be 1 

Use of the default constants effectively reduces the formula above to: 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/enhanced-interior-gateway-routing-protocol-eigrp/whitepaper_C11-720525.html 


Q14. - (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). 


Q15. - (Topic 3) 

In the Frame Relay network, 

which IP addresses would be assigned to the interfaces with point-to-point PVCs? 

A. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.10.3/24 

B. DLCI 16 192.168.10.1 /24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.12.1/24 DLCI 28 192.168.13.1/24 

C. DLCI 16 192.168.10.1/24 DLCI 17 192.168.11.1/24 DLCI 99 192.168.10.2/24 DLCI 28 192.168.11.2/24 

D. DLCI 16 192.168.10.1/24 DLCI 17 192.168.10.2/24 DLCI 99 192.168.10.3/24 DLCI 28 192.168.10.4/24 

Answer:

Explanation: 

DLCI 16 and DLCI 19 need to act like a point-to-point link and will therefore need to be on the same network as will DLCI 17 and DLCI 28. With this information we can see that option "B" is the only option that has the corresponding DLCI's on the same network based on the ip addresses and subnetmask. Option "D" is incorrect because, this would put the same network on both interfaces of the R2 router. Option "A" is similar. 


Most recent 200-105 practice:

Q16. - (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: 


Q17. - (Topic 2) 

Which commands are required to properly configure a router to run OSPF and to add network 192.168.16.0/24 to OSPF area 0? (Choose two.) 

A. Router(config)# router ospf 0 

B. Router(config)# router ospf 1 

C. Router(config)# router ospf area 0 

D. Router(config-router)# network 192.168.16.0 0.0.0.255 0 

E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0 

F. Router(config-router)# network 192.168.16.0 255.255.255.0 area 0 

Answer: B,E 

Explanation: 

In the router ospf Command, the ranges from 1 to 65535 so o is an invalid number - B is correct but A is not correct. To configure OSPF, we need a wildcard in the “network” statement, not a subnet mask. We also need to assign an area to this process - E is correct. 


Q18. - (Topic 2) 

Which statement describes an EIGRP feasible successor route? 

A. A primary route, added to the routing table 

B. A backup route, added to the routing table 

C. A primary route, added to the topology table 

D. A backup route, added to the topology table 

Answer:

Explanation: 

Two terms that appear often in the EIGRP world are "successor" and "feasible successor". A successor is the route with the best metric to reach a destination. That route is stored in the routing table. A feasible successor is a backup path to reach that same destination that can be used immediately if the successor route fails. These backup routes are stored in the topology table. 

Reference: http://study-ccna.com/eigrp-overview 


Q19. - (Topic 3) 

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 

Answer:

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. 


Q20. - (Topic 3) 

At which layer of the OSI model does PPP perform? 

A. Layer 2 

B. Layer 3 

C. Layer 4 

D. Layer 5 

Answer:

Explanation: 

Point-to-Point Protocol (PPP) is a data link protocol commonly used in establishing a direct connection between two networking nodes. It can provide connection authentication, transmission encryption (using ECP, RFC 1968), and compression.