Cisco 200-120 Online Practice Questions and Exam Preparation

Cisco 200-120 Online Questions & Answers

• Question 171:

  A network administrator is troubleshooting the OSPF configuration of routers R1 and R2. The routers cannot establish an adjacency relationship on their common Ethernet link.

  

  The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2. Based on the information in the graphic, what is the cause of this problem?

  A. The OSPF area is not configured properly.
  B. The priority on R1 should be set higher.
  C. The cost on R1 should be set higher.
  D. The hello and dead timers are not configured properly.
  E. A backup designated router needs to be added to the network.
  F. The OSPF process ID numbers must match.
  D. The hello and dead timers are not configured properly.

  ---

  In OSPF, the hello and dead intervals must match and here we can see the hello interval is set to 5 on R1 and 10 on R2. The dead interval is also set to 20 on R1 but it is 40 on R2.

• Question 172:

  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.
  B. A hub is connected directly to FastEthernet0/5.
  E. FastEthernet0/1 is configured as a trunk link.

  ---

  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.

• Question 173:

  What command visualizes the general NetFlow data on the command line?

  A. show ip flow export
  B. show ip flow top-talkers
  C. show ip cache flow
  D. show mls sampling
  E. show mls netflow ip
  C. show ip cache flow

  ---

  The following is an example of how to visualize the NetFlow data using the CLI. There are three methods to visualize the data depending on the version of Cisco IOS Software. The traditional show command for NetFlow is "show ip cache flow" also available are two forms of top talker commands. One of the top talkers commands uses a static configuration to view top talkers in the network and another command called dynamic top talkers allows real-time sorting and aggregation of NetFlow data. Also shown is a show MLS command to view the hardware cache on the Cisco Catalyst 6500 Series Switch. The following is the original NetFlow show command used for many years in Cisco IOS Software. Information provided includes packet size distribution; basic statistics about number of flows and export timer setting, a view of the protocol distribution statistics and the NetFlow cache.

  The "show ip cache flow" command displays a summary of the NetFlow accounting statistics.

  

  Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-netflow/prod_white_paper0900aecd80406232.html

• Question 174:

  Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)

  A. 802.1Q native VLAN frames are untagged by default.
  B. 802.1Q trunking ports can also be secure ports.
  C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces.
  D. 802.1Q trunks require full-duplex, point-to-point connectivity.
  E. 802.1Q trunks should have native VLANs that are the same at both ends.
  A. 802.1Q native VLAN frames are untagged by default.
  C. 802.1Q trunks can use 10 Mb/s Ethernet interfaces.
  E. 802.1Q trunks should have native VLANs that are the same at both ends.

  ---

  By default, 802.1Q trunk defined Native VLAN in order to forward unmarked frame. Switches can forward Layer 2 frame from Native VLAN on unmarked trunks port. Receiver switches will transmit all unmarked packets to Native VLAN. Native VLAN is the default VLAN configuration of port. Note for the 802.1Q trunk ports between two devices, the same Native VLAN configuration is required on both sides of the link. If the Native VLAN in 802.1Q trunk ports on same trunk link is properly configured, it could lead to layer 2 loops. The 802.1Q trunk link transmits VLAN information through Ethernet.

• Question 175:

  Which command encrypts all plaintext passwords?

  A. Router# service password-encryption
  B. Router(config)# password-encryption
  C. Router(config)# service password-encryption
  D. Router# password-encryption
  C. Router(config)# service password-encryption

  ---

  Command

  The "service password-encryption" command allows you to encrypt all passwords on your router so they cannot be easily guessed from your running-config. This command uses a very weak encryption because the router has to be very

  quickly decode the passwords for its operation.

  It is meant to prevent someone from looking over your shoulder and seeing the password, that is all. This is configured in global configuration mode.

• Question 176:

  Assuming the default switch configuration, which VLAN range can be added, modified, and removed on a Cisco switch?

  A. 1 through 1001
  B. 2 through 1001
  C. 1 through 1002
  D. 2 through 1005
  B. 2 through 1001

  ---

  VLAN 1 is the default VLAN on Cisco switch. It always exists and cannot be added, modified or removed. VLANs 1002-1005 are default VLANs for FDDI and Token Ring and they can't be deleted or used for Ethernet.

  

• Question 177:

  Refer to exhibit.

  

  A network administrator cannot establish a Telnet session with the indicated router. What is the cause of this failure?

  A. A Level 5 password is not set.
  B. An ACL is blocking Telnet access.
  C. The vty password is missing.
  D. The console password is missing.
  C. The vty password is missing.

  ---

  The login keyword has been set, but not password. This will result in the "password required, but none set" message to users trying to telnet to this router.

• Question 178:

  When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choose two.)

  A. network or subnetwork IP address
  B. broadcast address on the network
  C. IP address leased to the LAN
  D. IP address used by the interfaces
  E. manually assigned address to the clients
  F. designated IP address to the DHCP server
  A. network or subnetwork IP address
  B. broadcast address on the network

  ---

  Network or subnetwork IP address (for example 11.0.0.0/8 or 13.1.0.0/16) and broadcast address (for example 23.2.1.255/24) should never be assignable to hosts. When try to assign these addresses to hosts, you will receive an error message saying that they can't be assignable.

• Question 179:

  Refer to the exhibit.

  

  Hosts in network 192.168.2.0 are unable to reach hosts in network 192.168.3.0. Based on the output from RouterA, what are two possible reasons for the failure? (Choose two.)

  A. The cable that is connected to S0/0 on RouterA is faulty.
  B. Interface S0/0 on RouterB is administratively down.
  C. Interface S0/0 on RouterA is configured with an incorrect subnet mask.
  D. The IP address that is configured on S0/0 of RouterB is not in the correct subnet.
  E. Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU.
  F. The encapsulation that is configured on S0/0 of RouterB does not match the encapsulation that is configured on S0/0 of RouterA.
  E. Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU.
  F. The encapsulation that is configured on S0/0 of RouterB does not match the encapsulation that is configured on S0/0 of RouterA.

  ---

  From the output we can see that there is a problem with the Serial 0/0 interface. It is enabled, but the line protocol is down. There could be a result of mismatched encapsulation or the interface not receiving a clock signal from the CSU/DSU.

• Question 180:

  Which three statements accurately describe Layer 2 Ethernet switches? (Choose three.)

  A. Spanning Tree Protocol allows switches to automatically share VLAN information.
  B. Establishing VLANs increases the number of broadcast domains.
  C. Switches that are configured with VLANs make forwarding decisions based on both Layer 2 and Layer 3 address information.
  D. Microsegmentation decreases the number of collisions on the network.
  E. In a properly functioning network with redundant switched paths, each switched segment will contain one root bridge with all its ports in the forwarding state. All other switches in that broadcast domain will have only one root port.
  F. If a switch receives a frame for an unknown destination, it uses ARP to resolve the address.
  B. Establishing VLANs increases the number of broadcast domains.
  D. Microsegmentation decreases the number of collisions on the network.
  E. In a properly functioning network with redundant switched paths, each switched segment will contain one root bridge with all its ports in the forwarding state. All other switches in that broadcast domain will have only one root port.

  ---

  Microsegmentation is a network design (functionality) where each workstation or device on a network gets its own dedicated segment (collision domain) to the switch. Each network device gets the full bandwidth of the segment and does not

  have to share the segment with other devices. Microsegmentation reduces and can even eliminate collisions because each segment is its own collision domain ->.

  Note: Microsegmentation decreases the number of collisions but it increases the number of collision domains.