Most IP services use _______ as the data link layer protocol.

Most IP services use _______ as the data link layer protocol. 

a. Ethernet
b. TCP
c. MPLS
d. IRoute
e. T1

Answer: C

With IP services, the ________ at the sending site takes the outgoing message (which usually is an Ethernet frame containing an IP packet), strips off the Ethernet frame and uses the IP address in the IP packet to route the packet though the carrier's packet-switched network to its final destination.

With IP services, the ________ at the sending site takes the outgoing message (which usually is an Ethernet frame containing an IP packet), strips off the Ethernet frame and uses the IP address in the IP packet to route the packet though the carrier's packet-switched network to its final destination.

a. PAD
b. gateway
c. switch
d. router
e. WAN

Answer: A

Which of the following is not a key issue to be considered when selecting a WAN service?

Which of the following is not a key issue to be considered when selecting a WAN service? 

a. prestige value of using a particular common carrier
b. flexibility
c. capacity
d. control
e. reliability

Answer: A

Which of the following is not a way to reduce network demand?

Which of the following is not a way to reduce network demand? 

a. shifting network usage from high cost times to lower cost times
b. using data compression techniques for all data in the network
c. requiring a network impact statement for all application software developed by the organization
d. moving data further from the applications and people who use them
e. shifting network usage from peak to lower demand times

Answer: D

Dynamic routing:

Dynamic routing: 

a. imposes an overhead cost by increasing network traffic
b. decreases performance in networks which have many possible routes
c. decreases performance in networks with "bursty" traffic
d. should be used in 80 to 90 percent of total networks' capacity
e. is another term for static routing in WANs

Answer: A

The performance of WANs can be improved by:

The performance of WANs can be improved by: 

a. upgrading the circuits between the computers
b. increasing the demand placed on the network
c. downgrading the circuits between the computers
d. downgrading the devices that provide access to the circuits
e. increasing network traffic

Answer: A

________ is a term that refers to the speed in converting input packets to output packets.

________ is a term that refers to the speed in converting input packets to output packets.

a. Transfer mode
b. Latency
c. Burstiness
d. Cell relay
e. Frame relay

Answer: B

Which of the following is not a type of VPN?

Which of the following is not a type of VPN?

a. intranet VPN
b. extranet VPN
c. access VPN
d. T-1 VPN
e. a VPN that enables employees to access an organization's network from a remote location

Answer: D

_________ is a common standard for use by layer 2 access VPNs for encapsulation.

_________ is a common standard for use by layer 2 access VPNs for encapsulation.

a. L2TP
b. VPN2
c. Encapsule2
d. TCP/IP
e. PPP

Answer: A

Which of the following is a primary advantage of a VPN?

Which of the following is a primary advantage of a VPN?

a. low cost
b. inflexibility
c. unpredictable traffic congestion
d. security
e. complexity to the user

Answer: A

With a virtual private network, users create permanent virtual circuits through the Internet called:

With a virtual private network, users create permanent virtual circuits through the Internet called:

a. bursts
b. cells
c. tunnels
d. rings
e. clouds

Answer: C

A _______ is a particular type of network that uses circuits that run over the Internet but that appears to the user to be a private network.

A _______ is a particular type of network that uses circuits that run over the Internet but that appears to the user to be a private network.

a. local carrier network
b. virtual private network
c. integrated service digital network
d. software defined network
e. SONET network

Answer: B

Ethernet/IP packet networks:

Ethernet/IP packet networks:

a. are supported with gigabit fiber optic networks in large cities
b. are offered only by the common carriers
c. use token ring layer 2 media access control
d. use IPX/SPX protocols
e. provide CIR up to a maximum of 1.544 Mbps

Answer: A

_____ is sometimes called a Layer 2.5 technology.

_____ is sometimes called a Layer 2.5 technology. 

a. ATM
b. MPLS
c. Ethernet
d. TCP
e. IP

Answer: B

OC-3072 has a data rate of

OC-3072 has a data rate of 

a. 159.25 Gbps
b. 39.813 Gbps
c. 1.544 Mbps
d. 100 Mbps
e. 1.244 Gbps

Answer: A

___ are sometimes called private line services.

___ are sometimes called private line services. 

a. WANs
b. LANs
c. Circuit-switched networks
d. Dedicated-circuit networks
e. Routed-backbone networks

Answer: D

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

In a packet switched network, permanent virtual circuits that look very similar to a _____________ (for hardware-based dedicated circuits) move packets through the network.

a. cloud-based ring design
b. cloak-based mesh design
c. cloud-based mesh design
d. common carrier ring design
e. common carrier bus design

Answer: C

A _________ is a connection-oriented approach to sending packets on a packet switched service.

A _________ is a connection-oriented approach to sending packets on a packet switched service.

a. permanent virtual circuit
b. datagram
c. histogram
d. bursty packet
e. fractional T-1 network

Answer: A

A _______ is a connectionless method of sending data packets on a packet switched service.

A _______ is a connectionless method of sending data packets on a packet switched service.

a. bursty packet
b. virtual circuit
c. datagram
d. histogram
e. permanent virtual circuit

Answer: C

Which of the following type of networks permit packets from separate messages to be interleaved?

Which of the following type of networks permit packets from separate messages to be interleaved?

a. circuit switched network
b. dedicated circuit network
c. dial up circuit network
d. packet switched network
e. Fractional T-1 network

Answer: D