Cisco Certified Network Associate (CCNA)

Which three statements correctly describe Network Device A? (Choose three.)

• With a network wide mask of 255.255.255.128, each interface does not require an IP address.

• With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.

• With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.

• With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.

• With a network wide mask of 255.255.254.0, each interface does not require an IP address.

For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

• to uniquely identify devices at Layer 2

• to allow communication with devices on a different network

• to differentiate a Layer 2 frame from a Layer 3 packet

• to establish a priority system to determine which device gets to transmit first

• to allow communication between different devices on the same network

A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?

• This is a 10 Mb/s switch port.

• This is a 100 Mb/s switch port.

• This is an Ethernet port operating at half duplex.

• This is an Ethernet port operating at full duplex.

• This is a port on a network interface card in a PC.

Where does routing occur within the DoD TCP/IP reference model?

• application

• internet

• network

• transport

Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

• transport

• network

• presentation

• session

• application

Which of the following describes the roles of devices in a WAN? (Choose three.)

• A CSU/DSU terminates a digital local loop.

• A modem terminates a digital local loop.

• A CSU/DSU terminates an analog local loop.

• A modem terminates an analog local loop.

• A router is commonly considered a DTE device.

Host A pings interface S0/0 on router 3. What is the TTL value for that ping?

• 252

• 253

• 254

• 255

Host A is communicating with the server. What will be the source MAC address of the frames received by Host A from the server?

• the MAC address of router interface e0

• the MAC address of router interface e1

• the MAC address of the server network interface

• the MAC address of host A

A receiving host computes the checksum on a frame and determines that the frame is damaged. The frame is then discarded. At which OSI layer did this happen?

• session

• transport

• network

• data link

• physical

Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down.

Which of the following are true? (Choose two.)

• Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.

• Router C will use ICMP to inform Router B that Host 2 cannot be reached.

• Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.

• Router C will send a Destination Unreachable message type.

• Router C will send a Router Selection message type.