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
