Computer Networking Exam 2

Each hexadecimal character represents _ bits in binary.

8

The next-hop forwarding depends on the packet's original source and the path the packet has taken before it arrives at a particular packet switch. (T or F)

False

spans a large metropolitan area or city

MAN (metropolitan area network)

spans a region near an individual

PAN (Personal Area Network)

spans multiple cities or countries

WAN (Wide Area Network)

spans a floor or a building

LAN (Local Area Network)

Local Area Network (LAN) technologies were invented after the invention of Wide Area Network (WAN) technologies. (T or F)

True

For a WAN to operate correctly, each switch must have a forwarding table, and must forward packets. Furthermore, values in the forwarding table must guarantee _______________ and ________________ .

Optimal Routes and Universal Communication

A communication system that allows arbitrary pairs of computers to communicate is called ___.

universal service

Routers, unlike other devices on a network, use all five layers of the TCP/IP reference model. (T or F)

False

TCP/IP is the most important internetworking protocol suite and has been used on the Internet for decades. (T or F)

True

Which layer of the TCP/IP reference model specifies the format of packets sent across the Internet?

Internet

Layer 1

Physical

Layer 2

Network Interface

Layer 3

Internet

Layer 4

Transport Layer

Layer 5

Application

The goal of a wide area network is to allow as many computers as possible to send packets simultaneously. (T or F)

True

In _ routing, a program builds an initial forwarding table when a packet switch boots; the program then alters the table as conditions in the network change.

Dynamic

The two basic approaches to construct a forwarding table in a router are called _routing and _routing.

Static, Dynamic

A packet switch does not need to keep complete information about how to reach all possible computers; it only needs to know which outgoing link to use to reach a given switch.

True

The next-hop forwarding depends on the packet's original source and the path the packet has taken before it arrives at a particular packet switch. (T of F)

False

The basic hardware component used to connect heterogeneous (diverse) networks is a _________ .

Router

A router is used to connect two Wide Area Networks (WAN) provided that both networks use the same technology and protocols. (T or F)

False

Which layer of the TCP/IP reference model specifies the messages and procedures that are used to ensure reliable transfer?

Transport

TCP/IP is the most important internetworking protocol suite and has been used on the Internet for decades. (T or F)

True

What is the term used to describe an end system that connects to the Internet and runs applications?

Host

What three general properties define a circuit switched paradigm?

Performance equivalent to an isolated physical path, Separate steps for circuit creation, use, and termination, Point-to-Point communication

Communication between two parties on a circuit switched network is affected by communication between other parties sharing a common medium. (T or F)

False

The expense of packet switching technologies depend on the distances they span. (T or F)

True

A Media Access Control address is divided into a _-byte organizational unique ID and a _-byte block that identifies a particular network interface card (NIC).

3

Packet switching forms the basis for the Internet. (T or F)

True

identifies a subset of the computers on a given network, and specifies that each computer in the subset should receive a copy of the packet

multicast

uniquely identifies a single computer, and specifies that only the identified computer should receive a copy of the packet

unicast

corresponds to all computers, and specifies that each computer on the network should receive a copy of the packet

broadcast

Packet switching is typically associated with telephone technology. (T or F)

False

marks the beginning of a frame

SOH

contains information used to process the frame

header

contains the message being sent

payload

marks the end of a frame

EOT

Which of the following is not true concerning the individual Media Access Control address assigned to each piece of Internet interface hardware?

assigned by IEE

A maximum length specification of the local area network is a fundamental part of LAN technology because hardware is engineered to emit a fixed amount of energy. (T or F)

True

How is the type field in the Ethernet header used?

It provides multiplexing/demultiplexing allowing multiple protocols to operate simultaneously.

A Network Interface Card (NIC) is independent from the rest of the computer and a user can choose to replace the NIC without making other changes. (T or F)

True

Which field in an Ethernet frame provides demultiplexing that allows a computer to have multiple protocols operating simultaneously?

Type

_ cables can be used to connect switches to each other.

Crossover

The IEEE 802.16 standard applies to wireless _______ communication.

MAN

The primary use of Very Small Aperture Terminal (VSAT) technology is used in __________________ .

remote areas

The three building blocks of a wireless LAN are the _________________ , ___________________, and ______________ .

switch/router, hosts, access point

The IEEE 802.15 standard applies to wireless _______ communication.

PAN (Personal Area Network)

Which does not use Radio Frequency Identification (RFID) technology?

1. Access Control

2. Retail

3. Cellular Networks

4. Supply Chain Management

Cellular Networks

A repeater is an analog device used to broadcast messages across a Wide Area Network (WAN). (T or F)

False

A layer 2 switch is an electronic device that resembles a hub but simulates a bridged network that has only one computer per LAN segment. (T or F)

True

A Virtual Local Area Network (VLAN) switch allows a manager to configure a switch to emulate multiple, independent switches. (T or F)

True

Bridges do not blindly forward a copy of each frame from one LAN to another. Instead, bridges

use the destination MAC address and do not forward the frame to a LAN segment unless necessary.

The purpose of fiber modem extensions is to accept packets over the Ethernet interface and send over optical fiber, and accept packets from the optical fiber and send them over the Ethernet interface. (T or F)

True

The purpose of a repeater is to

amplify a signal

A mechanism used to connect two LAN segments and forward frames from one segment to another is called a

bridge

The purpose of a Distributed Spanning Tree (DST) is to

prevent broadcast messages from flowing in an endless loop.

A maximum length specification of the local area network is a fundamental part of LAN technology because hardware is engineered to emit a fixed amount of energy. (T or F)

True