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Cisco 640-875 - Questions & Answers

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Question 1
Single choice

What is the term that refers to a device that has no Customer Equipment directly connected to it in a Service Provider network?

A.

Provider Edge Router

B.

Customer Edge Router

C.

Non-customer Edge Router

D.

Provider Router

E.

Provider Edge Provider Router

Question 2
Single choice

Refer to the exhibit.

Host 3 on Network A is sending data to Host 8 on Network B.

Which address is the default gateway of Host 3?

A.

The address of the switch interface that is connected to router interface Fa0/0

B.

The address of the switch interface that is connected to router interface Fa0/1

C.

The address of the host that is connected to Network A

D.

The address of the host that is connected to Network B

E.

The address of the router interface Fa0/0

F.

The address of the router interface Fa0/1

Question 3
Single choice

The PE and CE interfaces are in the UP/UP state. The junior Network Engineer has validated Layer 3 functionality by pinging the adjacent interface, however the customer is unable to access the provider network.

What should be your next troubleshooting step?

A.

Validate that the encapsulation method is utilizing Point-to-Point Protocol

B.

Validate that the destination customer network is in the correct VRF

C.

Validate that the circuit clocking is inaccurate and needs to be synchronized on both sides

D.

Check the physical connection between both devices to ensure stability

E.

Identify incorrect RADIUS configuration is present on the PE device

F.

Check that an access-list is mis-configured on the loopback 0 interface and needs to be corrected

Question 4
Multiple choice

What are two differences between WAN and LAN? (Choose two.)

A.

The customer has explicit control of their own WAN.

B.

The customer can modify the service provider route distinguishers.

C.

The customer has explicit control of their LAN.

D.

The customer is aware of the infrastructure within the WAN.

E.

WANs will differ from LANs with attributes such as latency and distance.

Question 5
Single choice

Which of the following correctly pairs the dotted decimal subnet mask with the correct number of binary bits that represent the subnet mask?

A.

255.255.255.192 and /25

B.

255.255.255.248 and /28

C.

255.255.255.224 and /26

D.

255.255.255.248 and /27

E.

255.255.255.240 and /28

F.

255.255.255.240 and /16

Question 6
Multiple choice

What are two benefits of a star network topology? (Choose two.)

A.

Disruption of the entire network is not required when adding new machines.

B.

Any problem which leaves the network inoperable can be traced to the central hub.

C.

This network type requires less cable as compared to linear bus topology.

D.

The performance of one of the numerous nodes cannot reflect on the performance of other nodes.

E.

The performance of the entire network is directly dependent on the performance of the hub.

Question 7
Multiple choice

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.

Question 8
Single choice

To which transport protocol and port number does a host send a DHCP discover message?

A.

TCP 67

B.

IP 1

C.

IP 50

D.

UDP 67

Question 9
Single choice

Refer to the exhibit.
The netstat command is used to troubleshoot network issues at which OSI layer?

A.

application

B.

network

C.

data link

D.

transport

Question 10
Single choice

RouterA has an IP address of 192.168.1.1, and ServerA has an IP address of 192.168.1.100. You configure SNMP on RouterA to allow RouterA to be polled from ServerA. You discover that ServerA fails to access RouterA by using SNMP. You suspect than an inbound access list is blocking the requests.
To allow the polling, which type of traffic do you need to permit in the access list?

A.

UDP from host 192.168.1.100 and source port 161 to host 192.168.1.1

B.

UDP from host 192.168.1.100 to host 192.168.1.1 and destination port 161

C.

TCP from host 192.168.1.100 to host 192.168.1.1 and destination port 161

D.

TCP from host 192.168.1.100 and source port 161 to host 192.168.1.1

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