ncti 4 to 5 checkpoint questions

Which DSCP bits can administrators use to define custom DiffServ packet PHBs?

3-5

How large is the IP version 4 address field?

32 bits

What do bridges require that hubs and repeaters do not?

Address tables

Why is ATM better for multimedia?

All cells are the same size. Cells are small. ATM runs over fast fiber optics.

The OSI model Presentation Layer does which of the following?

All of the above

The Session Layer is concerned with which of the following?

All the above

Each wire of a local loop is sometimes referred to as:

Tip and Ring

What is the purpose of bandpass filtering on a POTS line?

To remove high-frequency noise

Which of the following commands shows the path between source and destination in a TCP/IP network?

Tracert

Which of the following is the primary purpose of a Physical Layer protocol?

Transmit bits across a physical link

Which of the following is the primary purpose of a Data Link Layer protocol?

Transmit frames across a physical link

Which of the following is the primary purpose of a Transport Layer protocol?

Transmit messages from process to process

The two primary classifications of bridges are:

Transparent and source route

Which layer uses port numbers for communication?

Transport Layer

A frame relay network uses fewer lines to connect 10 locations than a T1 mesh, and is therefore more cost effective. True or False?

True

Collisions are normal on CSMA/CD LANs and not usually the result of errors. True or False?

True

Frame headers and packet headers contain addresses. True or False?

True

The primary purpose of a device driver is to control hardware under the supervision of the OS. True or False?

True

Which of the following network topologies connects devices to a shared straight-line cable?

Bus Topology

Central offices are connected to which of the following:

Class 4 offices Other central offices Individual subscribers

Which class of Internet address provides the fewest network numbers, but the greatest number of hosts per network?

Class A

Three of the following terms mean the same thing. Which of the following terms does not mean the same as the others?

Common Channel Signaling

Which two are sources of H.323 network voice transmission delays? (Choose two.)

Compression delay

Which of the following scenarios requires a gateway?

Connecting an IP network to an AppleTalk network

Which of the following cable types can transmit data farthest?

Fiber optic

Which choices are TCP features? (Choose three.)

Flow control. Packet error recovery. Demultiplexing multiple applications.

An MG consists of which two components? (Choose two.)

Connections Endpoints

Signals may flow in either direction, but not simultaneously.

Half-duplex

The CD in CSMA/CD refers to the ability of an Ethernet node to do which of the following?

Detect frame collisions

The modified IP header ToS byte supports which QoS mechanism?

DiffServ

Which DHCP network address allocation mechanism assigns a host a temporary IP address?

Dynamic

You need to reconfigure a Linux server to change the address of its default gateway. What tool should you use?

IFconfig

Which of the following is an example of a Network Layer protocol?

IP

M8L1 What should you use to inspect the IP address of a Windows operating system PC?

IPconfig

Which of the following shows the IP address assigned to a PC running Windows XP / 7?

IPconfig

The main reason for the creation of IP version 6 is:

IPv4 does not provide enough unique addresses

At what OSI model layer does DiffServ operate?

Layer 3

Which of the following applications use UDP services? (Choose three.)

TFTP SNMP DNS

What is the main advantage of using balanced signaling on a serial cable?

The cable can be longer because balanced signaling is less vulnerable to interference.

Which of the following would not be used in a typical star topology?

Thinnet

A dedicated CO circuit that links two points is referred to as a:

Tie Line

An Application Layer utility transmits network administration and control messages between nodes. It must not use any more of the network's bandwidth than absolutely necessary. If messages are corrupted or lost, the utility handles retransmission, so it doesn't need this service from the lower layers. This application should use the services of:

UDP

Which two TCP/IP tools can you use to force a workstation to renew its DHCP lease? (Choose two.)

Winipcfg

Can switches switch two frames simultaneously?

Yes

Bridges are needed in which of the following situations?

a. and b. only

Which activities occur at the Application Layer?

all of the above

Performance will likely increase in an Ethernet network when which of the following occurs?

hubs are replaced by switches

Which of the following is the primary difference between a public and private network?

who owns and maintains the network

Which of the following confirms connectivity between hosts?

ping

Tracert uses which of the following commands and IP fields to carry out its operation?

ping and TTL

Which OSI model layers are concerned primarily with applications?

top three

Which of the following troubleshooting tools tells you the distance, in hops, to the destination computer?

tracert

Segmenting traffic between different portions of a single LAN is referred to as:

traffic isolation

The connection between switching systems is referred to as a:

trunk

Coaxial Ethernet networks must obey the "5/4/3 rule:"

• Up to five segments can be connected in a series between transmitter and receiver. • Up to four signal-repeating devices (repeaters, hubs, bridges, or switches) may be used to connect segments. • A maximum of only three segments can contain Ethernet nodes.

Which ISDN protocol allows us to pass signaling between networked PBXs?

QSIG

In a Class A Internet address, which of the following network numbers are reserved? (Choose all that apply)

0 and 127

Ethernet operates at all speeds except which of the following?

16 Kbps

How many unique addresses are supported by IP version 6?

2 to the 128th power

How many wire pairs can be terminated on a 66 block?

25 or 50

How many 802.1p header bits identify the frame's priority, and how many frame classes does the standard define?

3, 8

The DiffServ DSCP specifies that how many bits in the modi- fied IP ToS field are used to designate the packet's PHB?

6

The default PCM voice digitization rate is ____________.

64 Kbps

21. Which tagging method supports thousands of VLANs?

802.1Q

Which VLAN tagging standard header does IEEE 802.1p modify to identify Ethernet frame priority?

802.1Q

Which of the following devices isolate traffic in an Ethernet network?

A Bridge, A Switch, and A Router (All of the above)

What makes a crossover cable different from a patch cord?

A crossover cable uses the 568A pattern on one jack, and the 568B pattern on the other. A patch cord uses the same pinout pattern on both jacks.

What is a broadcast frame?

A frame addressed to "all nodes"

At which points in a one-way, multiple hop, end-to-end IP communications session will a frame have to be built? (Choose two.)

At each hop's router outbond port at the sending host's LAN port

Which connector type is used with Thinnet coaxial cable?

BNC

What is the key reason that smart LAN administrators demand well-made cable connections?

Bad cable connections degrade a network's performance.

The SS7 ISUP protocol provides what services? (Choose two.)

Call control signaling to support ISDN multimedia services Protocols to connect calls over PSTN

QSIG supports which of the following ISDN supplementary services? (Choose three.)

Call transfer Calling party indentification Gerneric functions

M6L5 When a CO switch provides a business telephone switching services, it is referred to as:

Centex

To resolve FQDNs to binary IP addresses, resolvers contact which type of TCP/IP application server?

DNS

When two tones are used to signal switching equipment it is called:

DTMF

At which OSI layer do bridges operate?

Data Link Layer

At which OSI layer do switches reside?

Data Link Layer

What is the main advantage of star topology?

Ease of management

A Ping command uses which ICMP message types? (Choose two.)

Echo Request Echo Reply

a U.S. national trade organization that publishes hardware-oriented standards to guide its member companies

Electronic Industries Association (EIA)

A Class 5 office connects individual subscribers to the telephone network and is also referred to as:

End Office Central Office Local Office

What is the first step in troubleshooting a network?

Establish the symptoms.

Which of the following is the most popular LAN Data Link Layer technology?

Ethernet

Which of the following troubleshooting tools is not part of a standard TCP/IP implementation?

Event Viewer

A line that goes from a customer's site through a CO to a remote CO in another part of the country is known as a:

FX line

Signals may flow in both directions simultaneously.

Full-duplex

The H.323 component that provides such capabilities as billing, authentication, and accounting is a(n) _____.

Gatekeeper

Which two solutions might we use to address jitter problems in a VoIP network? (Choose two.)

Install devices that provide jitter buffers Prioritize network voice traffic

Which statement best describes ISDN DSS1?

It controls signaling between the customer and the CO.

Which term describes the variability of delay a packet experiences as it travels between network devices?

Jitter

The device that provides multiple telephone extensions access to a group of single telephone lines is a:

Key system

Which of the following is managed by the OS?

Keyboard input Screen display File I/O Peripheral control

Which of the following are the two primary types of light sources in fiber optic cables?

Laser diode and LED

Which choice describes the time it takes for a packet to move through a network?

Latency

Which of the following is another name for a CO?

Local exchange

The physical connection that links an individual telephone to the telephone company CO switch is referred to as a:

Local loop

Analog signals on copper cable can be distorted by:

Magnetic fields Alternating current fields Radio waves

Which of the following is most typical of a broadband network?

Multiple analog channels

Which of the following hardware devices builds a frame?

NIC

At which OSI layer do routers operate?

Network Layer

When signaling takes place over a separate path than the path the analog voice signal takes it is referred to as:

Out-of-band signaling

Which QoS parameter might most concern us considering the Internet's "best effort" delivery nature?

Packet loss

Hubs and repeaters operate at which layer of the OSI model?

Physical Layer

Which of the following is not a layer of the TCP/IP protocol stack?

Physical Layer

What components are common to all computer systems? (Check all that apply.)

Processor Memory Storage I/O

Which of the following is a function of hubs and repeaters?

Provide for cable extension Repeat digital signals Interconnect different cable types

How are bits represented on fiber optic cable?

Pulses (on/off) of light

Zones maintain domain name information in which record types?

RRs

Which of the following will not occur at the Physical Layer?

Rerouting of information

Which of the following network topologies forms a closed loop?

Ring Topology

The digital network used to create the route a call will take is referred to as:

SS7

Which SS7 network component stores customer information in databases?

Signaling Control Point

A signal may flow in only one direction. A commercial radio station uses simplex communication because listeners cannot transmit radio signals back to the station.

Simplex

An organization that researches and institutes electrical standards for communication and other technologies.

The Institute of Electrical and Electronics Engineers (IEEE)

has developed standards, such as Real-timeTransport Protocol (RTP), Integrated Services over Specific Link Layers (ISSLL) and RealTime Streaming Protocol (RTSP) to enable multimedia traffic over IP networks.

The Internet Engineering Task Force (IETF)

In the IP address 128.18.72.24:80, what does the number 80 represent?

The TCP or UDP port number

Which best describes IP's use of the TTL value?

The TTL specifies the time a datagram is allowed to remain on the network.

Which layers are primarily concerned with moving raw data?

The lower four

How does DHCP pass configuration information to TCP/IP hosts?

The option codes

Which best describes the UDP demultiplexing process?

UDP uses port numbers to allow multiple applications to communicate simultaneously on the same host.

You suspect that a crossover cable has been installed instead of a patch cable. What can you use to identify the cable? (Choose two.)

Visual inspection of both connectors Media tester/certifier

What is the most important troubleshooting question?

What has changed?

At what point does end-to-end delay in a voice conversation become unacceptable?

When it approaches 500 ms

M1L5 When is UTP cable preferred over STP?

When there is little electrical interference

Which of the following is the unit of data transferred by an ATM network?

cell

ATM requires fiber media to run. True or False?

false

WANs are shifting away from switched services and increasingly using dedicated network services. True or False?

false

Which of the following is not considered a QoS parameter?

flows

The Network Layer is to packets as the Data Link Layer is to:

frames

A sound card is what general type of computer component?

input and output

What does I/O stand for?

input and output

MGCP is also known as what type of protocol?

master and slave

The Transport Layer is not concerned with which of the following?

none of the above

The CS in CSMA/CD refers to the ability of an Ethernet node to do which of the following?

sense an electrical signal

A NIC is a device used for:

signaling

Which of the following WAN services usually provides the highest bandwidth?

sonet

An Ethernet LAN that uses UTP cabling and a hub as the physical medium is referred to as which of the following?

star

Which of the following cable types uses a T-connector to connect each NIC to the cable?

thinnet