ITN 100 Chapter 8 & 9 Study Guide

Routers connect two or more network segments that use the same or different data link protocols, but the same network protocol.

True

Routers use network layer address to forward packets between network segments.

True

Which of the following would be least effective in improving backbone performance?

adding new keyboards to the client computers

A ___________ is/are devices that permit a user to connect to a digital T-carrier service.

CSU/DSU

A backbone network that connects many backbone networks spanning several buildings at a single location is often called an Internet backbone.

False

A dedicated circuit is usually not available late at nights or on weekends.

False

A hardware device that operates at the application layer is a router.

False

A switched backbone uses a bus topology

False

An OC-1 circuit provides a data rate of 155 Mbps.

False

Backbone networks typically use lower speed circuits to interconnect a series of LANs and provide connections to other backbone networks.

False

Datagrams are connection-oriented.

False

Full mesh networks are inexpensive.

False

Layer-3 switches switch messages based on their data link layer address.

False

MPLS operate at layer 4.

False

One advantage of a routed backbone is that is requires little management.

False

Routed backbones use switches that move packets based on data link layer addresses.

False

Routers can only connect the same type of cable.

False

T carrier circuits can only be used to transmit voice.

False

The cable to connect BNs is usually twisted pair.

False

The committed information rate (CIR) in a permanent virtual circuit is the maximum allowable rate that the network will attempt to provide.

False

Today, a common carrier that provides long distance services is typically called a local exchange carrier.

False

VPNs offer high security because they operate through the Internet.

False

_____ are dedicated digital circuits that are the most commonly used form of dedicated circuit services in North America today.

T-carrier services

A backbone network is a high-speed network that connects many networks

True

A key advantage of a chassis switch is its flexibility.

True

Ethernet/IP packet networks:

are supported with gigabit fiber optic networks in large cities

In ______ geometric layout for a network, every computer is connected to every other computer often by point-to-point dedicated circuits.

full mesh design

Circuit capacity on a backbone network will not be improved by:

going from 100Base-T Ethernet to 10Base-T Ethernet

Dynamic routing:

imposes an overhead cost by increasing network traffic

Primary rate interface:

is typically offered only to commercial customers

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

low cost

Routers:

may also be called TCP/IP gateways

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

packet switched network

Devices in a rack are connected together using ___________.

patch cables

The _________________ is a Canadian government agency that regulates voice and data communication.

CRTC

The data rate for a T-3 circuit in North America is:

44.376 Mbps

The backbone architecture layer that is closest to the users is the

Access layer

VLANs prioritize traffic based on the ______.

IEEE 802.1q standard

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

MPLS

A subnetted or hierarchical backbone can also be called:

Routed backbone

_________ move packets along the backbone based on their network layer address.

Routed backbones

A __________ type of BN has a star topology with one device, such as a switch, at its center.

Switched Backbone

_________ have no backbone cable.

Switched backbones

Which of the following is not true about Layer-3 switches?

They can only switch messages based on their data link layer addresses.

Which of the following is true regarding switched backbones?

They place all network devices for one part of the building physically in the same room, often in a rack of equipment

Which of the following is not true about backbone networks?

They tend to use lower speed circuits than LANs.

An intranet VPN connects different organizations over the Internet.

True

One basic component of a backbone network is the hardware device that connects other networks to the backbone.

True

One difference between a switch and a router is that a router will only process messages addressed to the router, while a switch processes all messages.

True

Packet switched networks enable packets from separate messages or separate organizations to be interleaved for transmission.

True

WANs can connect BNs across distances that can span up to thousands of miles.

True

Which of the following is a fundamental backbone network architecture?

Virtual LAN

Which of the following is not a basic architecture for dedicated circuit networks?

bus

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

cloud-based mesh design

A star architecture:

connects all computers to one central computer that routes messages to the appropriate computer

A star topology is:

dependent upon the capacity of the central computer for its performance

Which of the following is not a type of hardware device that can be used to interconnect networks?

dumb terminals

Basic rate interface:

provides a communications circuit with two 64 Kbps B channels, plus one D channel

Mesh networks:

require more processing by each computer in the network than in star or ring networks

A ________ geometric layout connects all computers in a closed loop, with each computer linked to the next usually with a series of point-to-point dedicated circuits.

ring design

A _____________ type of BN segments (each of which has a special set of subnet addresses that can be managed by different network managers) each part of the network connected to the backbone.

routed backbone

Which of the following is not a way that a router differs from a switch?

routers can connect two or more networks that use the same data link protocol

Device performance on a backbone network will not be improved by:

translating packets from one protocol to another as they enter the BN