Cisco 200-120 Online Practice Questions and Exam Preparation

Cisco 200-120 Online Questions & Answers

• Question 21:

  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.
  A. It identifies the source of a Type 1 LSA.
  D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.

  ---

  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

  We can see OSPF Router ID will be used as source of Type 1 LSA. Also the router will chose the highest loopback interface as its OSPF router ID (if available).

• Question 22:

  Refer to the exhibit.

  

  The network administrator must establish a route by which London workstations can forward traffic to the Manchester workstations. What is the simplest way to accomplish this?

  A. Configure a dynamic routing protocol on London to advertise all routes to Manchester.
  B. Configure a dynamic routing protocol on London to advertise summarized routes to Manchester.
  C. Configure a dynamic routing protocol on Manchester to advertise a default route to the London router.
  D. Configure a static default route on London with a next hop of 10.1.1.1.
  E. Configure a static route on London to direct all traffic destined for 172.16.0.0/22 to 10.1.1.2.
  F. Configure Manchester to advertise a static default route to London.
  E. Configure a static route on London to direct all traffic destined for 172.16.0.0/22 to 10.1.1.2.

  ---

  This static route will allow for communication to the Manchester workstations and it is better to use this more specific route than a default route as traffic destined to the Internet will then not go out the London Internet connection.

• Question 23:

  Scenario

  Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.

  The EIGRP routing protocol is configured.

  You are required to troubleshoot and resolve the EIGRP issues between the various routers.

  Use the appropriate show commands to troubleshoot the issues.

  

  

  

  The loopback interfaces on R4 with the IP addresses of 10.4.4.4/32, 10.4.4.5/32, and 10.4.4.6/32 are not appearing in the routing table of R5. Why are the interfaces missing?

  A. The interfaces are shutdown, so they are not being advertised.
  B. R4 has been incorrectly configured to be in another AS, so it does not peer with R5.
  C. Automatic summarization is enabled, so only the 10.0.0.0 network is displayed.
  D. The loopback addresses haven't been advertised, and the network command is missing on R4.
  B. R4 has been incorrectly configured to be in another AS, so it does not peer with R5.

  ---

  For an EIGRP neighbor to form, the following must match:

  -Neighbors must be in the same subnet

  -K values

  -AS numbers

  -Authentication method and key strings

  Here, we see that R4 is configured for EIGRP AS 2, when it should be AS 1.

  

• Question 24:

  Which PPP subprotocol negotiates authentication options?

  A. NCP
  B. ISDN
  C. SLIP
  D. LCP
  E. DLCI
  D. LCP

  ---

  The PPP Link Control Protocol (LCP) is documented in RFC 1661. LPC negotiates link and PPP parameters to dynamically configure the data link layer of a PPP connection. Common LCP options include the PPP MRU, the authentication protocol, compression of PPP header fields, callback, and multilink options.

• Question 25:

  What is the purpose of the POST operation on a router?

  A. determine whether additional hardware has been added
  B. locate an IOS image for booting
  C. enable a TFTP server
  D. set the configuration register
  A. determine whether additional hardware has been added

• Question 26:

  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
  B. Router(config)# router ospf 1
  E. Router(config-router)# network 192.168.16.0 0.0.0.255 area 0

  ---

  In the router ospf command, the ranges from 1 to 65535 so o is an invalid number -> but

  To configure OSPF, we need a wildcard in the "network" statement, not a subnet mask. We also need to assgin an area to this process ->.

• Question 27:

  What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

  A. It requires the use of ARP.
  B. It can support multiple IPv6 subnets on a single link.
  C. It supports up to 2 instances of OSPFv3 over a common link.
  D. It routes over links rather than over networks.
  B. It can support multiple IPv6 subnets on a single link.
  D. It routes over links rather than over networks.

  ---

  Here is a list of the differences between OSPFv2 and OSPFv3:

  They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols

  

  OSPFv3 introduces new LSA types

  

  OSPFv3 has different packet format

  

  OSPFv3 uses different flooding scope bits (U/S2/S1)

  

  OSPFv3 adjacencies are formed over link-local IPv6 communications

  

  OSPFv3 runs per-link rather than per-subnet

  

  OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

  

  OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)

  

  OSPFv3 Neighbor Authentication done with IPsec (AH)

  

  OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

  

  Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html

• Question 28:

  Which type of EIGRP route entry describes a feasible successor?

  A. a backup route, stored in the routing table
  B. a primary route, stored in the routing table
  C. a backup route, stored in the topology table
  D. a primary route, stored in the topology table
  C. a backup route, stored in the topology table

  ---

  EIGRP uses the Neighbor Table to list adjacent routers. The Topology Table list all the learned routers to destination whilst the Routing Table contains the best route to a destination, which is known as the Successor. The Feasible Successor is a backup route to a destination which is kept in the Topology Table.

• Question 29:

  Scenario:

  Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links. You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the

  main office and the routers located in the remote branch offices.

  

  

  

  R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

  A. R1 ethernet0/1 is shutdown. Configure no shutdown command.
  B. R1 ethernet0/1 configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25.
  C. R2 ethernet0/1 and R3 ethernet0/0 are configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25.
  D. Enable OSPF for R1 ethernet0/1; configure ip ospf 1 area 0 command under ethernet0/1.
  B. R1 ethernet0/1 configured with a non-default OSPF hello interval of 25; configure no ip ospf hello-interval 25.

  ---

  Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).

  

• Question 30:

  Which three statements about link-state routing are true? (Choose three.)

  A. Routes are updated when a change in topology occurs.
  B. Updates are sent to a multicast address by default.
  C. OSPF is a link-state protocol.
  D. Updates are sent to a broadcast address.
  E. RIP is a link-state protocol.
  F. It uses split horizon.
  A. Routes are updated when a change in topology occurs.
  B. Updates are sent to a multicast address by default.
  C. OSPF is a link-state protocol.