ncti 4 to 5 checkpoint questions
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 Robbed-bit signaling Channel Associated Signaling In-band signaling
An MG consists of which two components? (Choose two.)
Controllers Call agents Endpoints Connections
How many 802.1p header bits identify the frame's priority, and how many frame classes does the standard define?
2, 4 3, 8 4, 16 5, 32
How many unique addresses are supported by IP version 6?
2^32 32^128 128^2 2^128
Which of the following is a function of hubs and repeaters?
Provide for cable extension Repeat digital signals Interconnect different cable types All of the above
What do bridges require that hubs and repeaters do not?
Software Address tables Two segments All of the above
Frame headers and packet headers contain addresses. True or False?
True False
Which OSI model layers are concerned primarily with applications?
All seven The top three The lower four
Which layers are primarily concerned with moving raw data?
All seven The top three The lower four
Which of the following is not considered a QoS parameter?
Bandwidth Flows Jitter Delay
M6L5 When a CO switch provides a business telephone switching services, it is referred to as:
DACs NAR Centrex CO provisioning
Which of the following is most typical of a broadband network?
Digital to digital Multiple analog channels One-way transmission of digital information Single analog channel
A Ping command uses which ICMP message types? (Choose two.)
Echo Request Source quench Redirect Echo Reply
How are bits represented on fiber optic cable?
Electrical signals Pulses (on/off) of light Changing wavelength None of the above
Which choice describes the time it takes for a packet to move through a network?
Encoding Latency Propagation Loss
A Class 5 office connects individual subscribers to the telephone network and is also referred to as:
End Office Central Office Local Office All of the above
Which of the following shows the IP address assigned to a PC running Windows XP / 7?
IFconfig Winipcfg IPconfig PCconfig
What does I/O stand for?
Input / Output Inside / Outside Inline / Out of Bounds Internet / Outernet
At what OSI model layer does DiffServ operate?
Layer 2 Layer 3 Layer 4 Layer 5
Zones maintain domain name information in which record types?
Zone records RRs Domain records Authority records
Which of the following hardware devices builds a frame?
Media adapter unit Node port Light emitting diode (LED) NIC
The OSI model Presentation Layer does which of the following?
Manages the way computers read information Encrypts and decrypts information Is concerned with the order of bytes and integers All of the above
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 False
ATM requires fiber media to run. True or False?
True False
Collisions are normal on CSMA/CD LANs and not usually the result of errors. True or False?
True False
WANs are shifting away from switched services and increasingly using dedicated network services. True or False?
True False
The primary purpose of a device driver is to control hardware under the supervision of the OS. True or False?
True false
A dedicated CO circuit that links two points is referred to as a:
Trunk POTS line Tie Line FX line
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:
Trunk POTS line Tie Line FX line
The default PCM voice digitization rate is ____________.
64 Kbps 13 Kbps 18 Kbps 56 Kbps
How large is the IP version 4 address field?
64 bits 128 bits 32 bits 24 bits
How many wire pairs can be terminated on a 66 block?
66 50 or 100 33 25 or 50
MGCP is also known as what type of protocol?
Master/slave Peer-to-peer Point-to-point Transcoding
Which of the following troubleshooting tools is not part of a standard TCP/IP implementation?
Netstat Ping Tracert Event Viewer
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 In-band signaling SS7 Dial tone signaling
The device that provides multiple telephone extensions access to a group of single telephone lines is a:
PBX FX Key system Cordless system
Which term describes the variability of delay a packet experiences as it travels between network devices?
Propagation Compression Loss Jitter
Which connector type is used with Thinnet coaxial cable?
RJ-45 RG-58 BNC
What is the main advantage of star topology?
Redundancy Ease of management Minimize cable requirements
An Ethernet LAN that uses UTP cabling and a hub as the physical medium is referred to as which of the following?
Star Star/ring Bus Ring
A NIC is a device used for:
Storage Processing Signaling Memory
Which choices are TCP features? (Choose three.)
Best effort packet delivery Flow control Packet error recovery Demultiplexing multiple applications
Which ISDN protocol allows us to pass signaling between networked PBXs?
DSS1 Q.931 LAPD QSIG
The CD in CSMA/CD refers to the ability of an Ethernet node to do which of the following?
Access the physical medium Detect frame collisions Detect node failures Sense an electrical signal
The CS in CSMA/CD refers to the ability of an Ethernet node to do which of the following?
Access the physical medium Detect frame collisions Detect node failures Sense an electrical signal
The Transport Layer is not concerned with which of the following?
Addressing Connection management Flow control Buffering None of the above
Why is ATM better for multimedia?
All cells are the same size. Cells are small. ATM runs over fast fiber optics. All of the above.
Which of the following is the most popular LAN Data Link Layer technology?
Token Ring FDDI SNA Ethernet
Bridges are needed in which of the following situations?
Too much traffic on the LAN Remote connection of two LANs over a WAN link Broadcast storms All of the above a. and b. only
Performance will likely increase in an Ethernet network when which of the following occurs?
Switches are replaced by hubs. Routers are replaced by hubs. Switches are replaced by bridges. Hubs are replaced by switches.
When two tones are used to signal switching equipment it is called:
Tip and Ring Step-by-step DTMF Out-of-band signaling
Which of the following will not occur at the Physical Layer?
Transmission of bits Two-way traffic Modulation Rerouting of information
Which of the following is the primary purpose of a Physical Layer protocol?
Transmit bits across a physical link Transmit frames across a physical link Detect duplicate packets Transmit packets across a network
Which of the following is the primary purpose of a Transport Layer protocol?
Transmit bits across a physical link Transmit frames across a physical link Transmit packets across a network Transmit messages from process to process
Which of the following is the primary purpose of a Data Link Layer protocol?
Transmit bits across a physical link Transmit messages between processes Transmit frames across a physical link Transmit packets across a network
The two primary classifications of bridges are:
Transparent and source route FDDI and Ethernet Ethernet and Token Ring Token Ring and FDDI
Which of the following network topologies forms a closed loop?
Bus topology Broadcast topology Loop topology Ring topology
Which of the following network topologies connects devices to a shared straight-line cable?
Bus topology Ring topology Loop topology Star ring topology
Central offices are connected to which of the following:
Class 4 offices Other central offices Individual subscribers All of the above
Which class of Internet address provides the fewest network numbers, but the greatest number of hosts per network?
Class A Class B Class C Class D
Which two are sources of H.323 network voice transmission delays? (Choose two.)
Compression delay DSP delay MOS delay Call setup delay
Which of the following scenarios requires a gateway?
Connecting an IP network to an AppleTalk network Connecting an IP network to an IP network Connecting three IP networks Connecting a twisted pair network to a fiber optic network
You need to reconfigure a Linux server to change the address of its default gateway. What tool should you use?
IPconfig ipcfg NETconfig IFconfig route add
The main reason for the creation of IP version 6 is:
IPv4 is too slow Internet video requires packet prioritization IPv4 does not provide enough unique addresses Jumbograms are now standard on most LANs
Which of the following WAN services usually provides the highest bandwidth?
T1 T3 SMDS SONET
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:
TCP UDP ICMP RARP
How does DHCP pass configuration information to TCP/IP hosts?
TFTP server UDP port numbers The subnet mask The option codes
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 cable types can transmit data farthest?
Thinnet UTP STP Fiber optic
Which of the following cable types uses a T-connector to connect each NIC to the cable?
Thinnet UTP Thicknet Fiber optic
Which of the following is the primary difference between a public and private network?
Who owns and maintains the network The distance between communicating devices The cost of the equipment The number of nodes in the network
What is the most important troubleshooting question?
Why is the problem happening? What exactly is happening? What has changed? Whose fault is it?
Can switches switch two frames simultaneously?
Yes No
Which activities occur at the Application Layer?
File transfer and access email Web browser All of the above
In a Class A Internet address, which of the following network numbers are reserved? (Choose all that apply)
0 172 127 168
Which of the following devices isolate traffic in an Ethernet network?
Bridge Switch Router All of the above
Which of the following is the unit of data transferred by an ATM network?
Frame Packet Cell Message
Which two solutions might we use to address jitter problems in a VoIP network? (Choose two.)
Implement forward error correction Install devices that provide jitter buffers Prioritize network voice traffic Implement advanced compression schemes
Which statement best describes ISDN DSS1?
It supports ISDN transmission within a customer's premises It supports QSIG signaling between customer PBXs It defines ISDN packet-switched data communication It controls signaling between the customer and the CO.
Which layer uses port numbers for communication?
Session Layer Transport Layer Data Link Layer Data Link Layer
In the IP address 128.18.72.24:80, what does the number 80 represent?
The host address The network number The domain name number The TCP or UDP port number
Which of the following would not be used in a typical star topology?
UTP cabling Hub NICs Thinnet
Which DSCP bits can administrators use to define custom DiffServ packet PHBs?
0-2 3-5 5-7 2-4
Which VLAN tagging standard header does IEEE 802.1p modify to identify Ethernet frame priority?
02.10 802.1D 802.1Q ISL
Ethernet operates at all speeds except which of the following?
16 Kbps 10 Mbps 1 Gbps 100 Mbps
The DiffServ DSCP specifies that how many bits in the modi- fied IP ToS field are used to designate the packet's PHB?
6 7 8 12
21. Which tagging method supports thousands of VLANs?
802.1Q 802.1p ISL 802.3
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" A frame addressed to one node, but received by all nodes on the same hub A frame transmitted over a wireless LAN A frame transmitted over a cable television Internet connection
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 the receiving host's LAN port At each hop's router outbound port At the sending host's LAN port At each hop's router inbound port
Which DHCP network address allocation mechanism assigns a host a temporary IP address?
Automatic Dynamic Manual Static
Segmenting traffic between different portions of a single LAN is referred to as:
Bandwidth reduction Traffic isolation Traffic reduction Frame isolation
The SS7 ISUP protocol provides what services? (Choose two.)
Call control signaling to support ISDN multimedia services Call control over point-to-point links Protocols to connect calls over the PSTN Non-call control-related database queries
At which OSI layer do routers operate?
Data Link Layer Network Layer Transport Layer Physical Layer
At which OSI layer do switches reside?
Data Link Layer Physical Layer Transport Layer Network Layer
At which OSI layer do bridges operate?
Data Link Layer Transport Layer Physical Layer Network Layer
Which of the following is an example of a Network Layer protocol?
Ethernet IP TCP RS-232
Which of the following applications use UDP services? (Choose three.)
FTP TFTP SNMP DNS
The Network Layer is to packets as the Data Link Layer is to:
Frames Signals Bits Protocol suites
The H.323 component that provides such capabilities as billing, authentication, and accounting is a(n) _____.
Gateway Gatekeeper Agent Terminal
Which of the following is not a layer of the TCP/IP protocol stack?
Internetwork Layer Physical Layer Transport Layer Application Layer
What is the first step in troubleshooting a network?
Isolate the problem Establish the symptoms Interview the user Open a trouble ticket
Which QoS parameter might most concern us considering the Internet's "best effort" delivery nature?
Jitter Packet loss Delay Bandwidth
Which of the following is managed by the OS?
Keyboard input Screen display File I/O Peripheral control all of the above
Which of the following is another name for a CO?
Local exchange PBX Local loop MUX
The connection between switching systems is referred to as a:
Local loop Trunk Channel Digital Circuit
The physical connection that links an individual telephone to the telephone company CO switch is referred to as a:
Local loop Trunk Channel Digital Circuit
The Session Layer is concerned with which of the following?
Managing dialog Beginning dialog Ending dialog All of the above
Which two TCP/IP tools can you use to force a workstation to renew its DHCP lease? (Choose two.)
Netstat Nbtstat Winipcfg IPconfig
The digital network used to create the route a call will take is referred to as:
Out-of-band signaling In-band signaling SS7 Dial tone signaling
QSIG supports which of the following ISDN supplementary services? (Choose three.)
Packet switching Call transfer Calling party identification Generic functions
Hubs and repeaters operate at which layer of the OSI model?
Physical Layer Network Layer Transport Layer Data Link Layer
M8L1 What should you use to inspect the IP address of a Windows operating system PC?
Ping Winipcfg IPconfig IFconfig
Which of the following confirms connectivity between hosts?
Ping Winipcfg Netstat Nbtstat
Which of the following commands shows the path between source and destination in a TCP/IP network?
Ping Winipcfg Tracert Nbtstat
Which of the following troubleshooting tools tells you the distance, in hops, to the destination computer?
Ping Winipcfg Tracert Nbtstat
Tracert uses which of the following commands and IP fields to carry out its operation?
Ping and header Nbtstat and trailer Ping and TTL Ping and type
Each wire of a local loop is sometimes referred to as:
Plug and Play Tip and Ring Plug and Socket Ring and Plug
A sound card is what general type of computer component?
Processor Memory Input/output Storage
What components are common to all computer systems? (Check all that apply.)
Processor Memory Storage I/O
The modified IP header ToS byte supports which QoS mechanism?
SDM RSVP 802.1p/Q DiffServ
Which SS7 network component stores customer information in databases?
Signaling Control Point Session Initiation Point Signal Transfer Point Service Switching Point
Which best describes IP's use of the TTL value?
The TTL designates how long the sending host has been online. The TTL specifies the time a datagram is allowed to remain on the network. The TTL designates the number of seconds the packet has been on the network segment. The TTL counts the number of seconds a datagram has been queued at each router.
What is the key reason that smart LAN administrators demand well-made cable connections?
The neat appearance helps justify expensive systems to upper management. Good cable connections are more durable. Bad cable connections degrade a network's performance. Good cable connections boost a network's data rate higher than the normal maximum for a LAN protocol.
Which best describes the UDP demultiplexing process?
UDP enables the destination host to route received packets across multiple IP addresses. UDP enables the destination host to route received packets across multiple IP addresses. UDP uses port numbers to allow multiple applications to communicate simultaneously on the same host. UDP allows multiple hosts to communicate across a single, virtual circuit.
Which of the following are the two primary types of light sources in fiber optic cables?
UTP and STP Laser diode and LED Multimode and single-mode EMI and RFI
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 Tone generator/probe Media tester/certifier Time delay reflectometer
To resolve FQDNs to binary IP addresses, resolvers contact which type of TCP/IP application server?
WINS NetBIOS DHCP DNS
At what point does end-to-end delay in a voice conversation become unacceptable?
When it approaches 500 ms When it exceeds 400 ms When it approaches 300 ms When it exceeds 150 ms
M1L5 When is UTP cable preferred over STP?
When there is little electrical interference When cost is no object When going long distances
