Cisco 640-875 Online Practice Questions and Exam Preparation

Cisco 640-875 Online Questions & Answers

• Question 81:

  Given these four Class B networks: 172.104.0.0, 172.105.0.0, 172.106.0.0, 172.107.0.0, what is the supernet (CIDR) address that summarizes these four Class B networks?

  A. 172.104.0.0/12
  B. 172.104.0.0/13
  C. 172.104.0.0/14
  D. 172.104.0.0/15
  C. 172.104.0.0/14

• Question 82:

  Refer to the exhibit.

  

  Two routers are named R1 and R2. R1 runs Cisco IOS Software. R2 runs Cisco IOS XR Software. To form an EIGRP IPv6 adjacency between the two routers, which three configurations must you add? (Choose three.)

  A. On R1, configure router-id with an IPv4 address.
  B. On R1, configure router-id with an IPv6 address.
  C. On R1, enter the no shutdown command inside the IPv6 EIGRP process.
  D. On R1 and R2, enter the eigrp no shutdown command inside the interfaces.
  E. On R1, configure IPv6 unicast routing in config mode.
  F. On R2, configure IPv6 unicast routing in config mode.
  A. On R1, configure router-id with an IPv4 address.
  C. On R1, enter the no shutdown command inside the IPv6 EIGRP process.
  E. On R1, configure IPv6 unicast routing in config mode.

• Question 83:

  SIMULATION

  

  A. Check the answer below.
  A. Check the answer below.

• Question 84:

  You have a router that is configured as an NTP server. Which command should you use on the router to allow NTP queries only from hosts that are permitted in access list 10?

  A. ntp access-group peer 10
  B. ntp access-group serve 10
  C. ntp access-group serve-only 10
  D. ntp access-group query-only 10
  C. ntp access-group serve-only 10

• Question 85:

  Refer to the exhibit. Which basic parameters does this configuration apply to the device?

  

  A. remote access parameters
  B. interface parameters
  C. global parameters
  D. DNS server parameters
  C. global parameters

• Question 86:

  Currently, a Cisco IOS XR router is configured to send IP SLA probes to a network management station that is acting as the IP SLA target device. How can IP SLA measurement accuracy be improved and also provide additional statistics?

  A. Use ICMP echo probes instead of UDP echo probes.
  B. Configure another Cisco router as the target and enable that other Cisco router for IP SLA Responder operations.
  C. Increase the rate (frequency) at which a specified IP SLA operation is sent into the network.
  D. Use UDP echo probes instead of ICMP echo probes and enable UDP echo service on the target network management station.
  E. Enable IP SLA Responder service on the target network management station.
  B. Configure another Cisco router as the target and enable that other Cisco router for IP SLA Responder operations.

• Question 87:

  You are having problems browsing to http://www.cisco.com from your laptop that is running Windows. Your laptop is connected directly to a default gateway, which is a Cisco ISR G2 router. Which four options are the basic troubleshooting steps that you should use to troubleshoot this issue? (Choose four.)

  A. Issue the ipconfig command from the Windows command line on your laptop to determine your laptop IP address and the default gateway IP address.
  B. Issue the ipconfig /all command from the Windows command line on your laptop to determine the DNS server IP address.
  C. Issue the ping {default gateway IP address} command from the Windows command line on your laptop to verify connectivity to the default gateway.
  D. Issue the ping {DNS server IP address} command from the Windows command line on your laptop to verify connectivity to the DNS server.
  E. Issue the ping tcp www.cisco.com 80 command from the Windows command line on your laptop to verify TCP port 80 connectivity to the www.cisco.com server.
  F. From the ISR G2 CLI, issue the ping tcp www.cisco.com 80 command to verify TCP port 80 connectivity to the www.cisco.com server.
  G. From the ISR G2 CLI, issue the ISR-G2#tracert www.cisco.com command to verify connectivity to the www.cisco.com server.
  H. From the ISR G2 CLI, issue the ISR-G2#nslookup www.cisco.com command to determine the IP address of the www.cisco.com server.
  A. Issue the ipconfig command from the Windows command line on your laptop to determine your laptop IP address and the default gateway IP address.
  B. Issue the ipconfig /all command from the Windows command line on your laptop to determine the DNS server IP address.
  C. Issue the ping {default gateway IP address} command from the Windows command line on your laptop to verify connectivity to the default gateway.
  D. Issue the ping {DNS server IP address} command from the Windows command line on your laptop to verify connectivity to the DNS server.

• Question 88:

  A Passive Optical Network is a point-to-multipoint FTTx network architecture that relies on which of the following?

  A. Electrically powered optical splitters
  B. Unpowered optical splitter
  C. Customer optical network terminal
  D. Network interface controller
  B. Unpowered optical splitter

• Question 89:

  What is the best way to secure the route processor on a Cisco device?

  A. Route processor traffic control
  B. Control plane quality of service
  C. Control plane policing
  D. Access lists
  C. Control plane policing

• Question 90:

  Which subnetwork mask should be used in a point-to-point link in order to use IPv4 address block more efficiently?

  A. 209.165.201.0/32
  B. 209.165.201.0/31
  C. 209.165.201.0/30
  D. 209.165.201.0/29
  E. 209.165.201.0/24
  B. 209.165.201.0/31