EOC Study 3c251 P2
Other part of the ures.
- 1.
Stress patterns are used mainly to identify malfunctioning T-1 transmission equipment and
- A.
Improper line voltages
- B.
Inadequately simulated data
- C.
Equipment speed limitations
- D.
Misoptioned network equipment
Correct Answer
D. Misoptioned network equipment -
- 2.
For circuits that use binary with B8ZS coding, which stress pattern test for T-1 circuits is useful for stressing the minimum ones density?
- A.
1-in-7
- B.
2-in-8
- C.
3-in-24
- D.
Quasi-random signal source (QRSS)
Correct Answer
A. 1-in-7 -
- 3.
In most cases, the signal level for commercial data circuits is between
- A.
0 and -10 dBm0
- B.
-10 and -13 dBm0
- C.
-18 and -22 dBm0
- D.
-20 and -24 dBm0
Correct Answer
C. -18 and -22 dBm0 -
- 4.
Which digital test is categorized as either controlled or uncontrolled?
- A.
All ones
- B.
Frame loss
- C.
Excess zeros
- D.
Timing slips
Correct Answer
D. Timing slips -
- 5.
During a 45-minute BERT, the number of frame errors for a T-1 superframe circuit should be less than
- A.
7
- B.
15
- C.
21
- D.
30
Correct Answer
C. 21 -
- 6.
When T-1 equipment receives no input signal, what is transmitted to keep the repeaters operating and to maintain timing?
- A.
Nothing
- B.
An all ones pattern
- C.
An all zeros pattern
- D.
A pseudo-random pattern
Correct Answer
B. An all ones pattern -
- 7.
Of the four main causes of T-1 impairments, cross talk is an example of
- A.
Data specific
- B.
Faulty equipment
- C.
Improper connections
- D.
Environmental factors
Correct Answer
D. Environmental factors -
- 8.
Which T-1 impairment is sometimes the hardest to isolate?
- A.
A data specific
- B.
Faulty equipment
- C.
Improper connection
- D.
Environmental factor
Correct Answer
D. Environmental factor -
- 9.
On T-1 circuit, dribbling errors are often caused by
- A.
Data specific
- B.
Faulty equipment
- C.
Improper connections
- D.
Environmental factors
Correct Answer
C. Improper connections -
- 10.
What can result from an impedance mismatch?
- A.
Impulse noise
- B.
High circuit noise
- C.
Envelope delay distortion
- D.
Excessive loss of signal power
Correct Answer
D. Excessive loss of signal power -
- 11.
In any given system configuration employing two or more transmission control terminals, how many terminals have full monitoring and control capability?
- A.
One
- B.
Two
- C.
Three
- D.
Four
Correct Answer
A. One -
- 12.
The capabilities of a transmission control (TRANCOM) system are a key factor in
- A.
Eliminating hazardous continuous
- B.
Requiring only slave terminals to operate.
- C.
Being able to establish more unmanned sites.
- D.
Removing maintenance support at DII sites
Correct Answer
D. Removing maintenance support at DII sites -
- 13.
Which do you not rely on as a fault isolation aid?
- A.
Operational adjustments
- B.
Customer complaints
- C.
Intercommunications
- D.
Test facilities
Correct Answer
B. Customer complaints -
- 14.
Diagrams that are useful in circuit-rerouting and fault-isolation because they show transmission facilities, routing, composition, and capacity describe what type of fault isolation aid?
- A.
Cabling records
- B.
Written procedures
- C.
System/network configuration plans
- D.
Ready reference charts and placards
Correct Answer
C. System/network configuration plans -
- 15.
Records that are maintained by telephone systems personnel and are useful for fault isolation describe what type of fault isolation aid?
- A.
Written procedures
- B.
System and network plans
- C.
Plant cabling cross reference files
- D.
Ready reference charts and placards
Correct Answer
C. Plant cabling cross reference files -
- 16.
What is the first thing you do when you find that a single channel of a T-1 is unusable or deteriorated?
- A.
Coordinate the repair or alignment
- B.
Make the appropriate replacement of equipment
- C.
Make the appropriate test to ensure proper operation of the circuit
- D.
Coordinate to transfer service to a spare channel or preempt a lower priority user.
Correct Answer
D. Coordinate to transfer service to a spare channel or preempt a lower priority user. -
- 17.
Where does the transmit output signal of the modem to the distant end station first appear on the patch bay?
- A.
The send equipment jack of the audio patch bay
- B.
The equipment module of the digital patch bay.
- C.
The receive line jack of the audio patch bay.
- D.
The line module of the digital patch bay.
Correct Answer
A. The send equipment jack of the audio patch bay -
- 18.
Where does the output signal of the modem to the router first appear on the patch bay?
- A.
The send equipment jack of the audio patch bay.
- B.
The equipment module of the digital patch bay.
- C.
The receive line jack of the audio patch bay.
- D.
The line module of the digital patch bay.
Correct Answer
B. The equipment module of the digital patch bay. -
- 19.
Which career field installs and maintains fixed and transportable low-frequency and high-frequency transmitters, receivers, and transceivers?
- A.
Communications cable and antenna systems
- B.
Satellite, wideband and telemetry systems.
- C.
Ground radio communications.
- D.
Telephone systems.
Correct Answer
C. Ground radio communications. -
- 20.
What device is a combination transmitter/receiver in a single package?
- A.
A transceiver
- B.
A repeater
- C.
A router
- D.
A hub
Correct Answer
A. A transceiver -
- 21.
What device operates at the Physical layer of the open system interconnection (OSI) model and is used in Ethernet networks to connect which device to a fiber or copper cable?
- A.
A transceiver
- B.
Gateway
- C.
Router
- D.
Switch
Correct Answer
A. A transceiver -
- 22.
What device provides the physical, electrical, and electronic connections to the network media?
- A.
Bridge
- B.
Router
- C.
Gateway
- D.
Network Interface Card
Correct Answer
D. Network Interface Card -
- 23.
What layers of the OSI model do NIC belong?
- A.
Data Link and Network layer
- B.
Physical layer and Network layer
- C.
Physical Layer and Data Link later
- D.
Physical, Data Link, Network layer.
Correct Answer
C. Physical Layer and Data Link later -
- 24.
The device that receives a digital signal and regenerates the signal along the next leg of the medium is a
- A.
Bridge
- B.
Brouter
- C.
Gateway
- D.
Repeater
Correct Answer
D. Repeater -
- 25.
A repeater with more than one output port is a
- A.
Hub
- B.
Bridge
- C.
Brouter
- D.
Gateway
Correct Answer
A. Hub -
- 26.
What can be used to extend the size of a network?
- A.
Brouter
- B.
Gateway
- C.
Active hub
- D.
Passive hub
Correct Answer
C. Active hub -
- 27.
What is a device that subdivides a network into smaller logical pieces, or segments?
- A.
Switch
- B.
Brouter
- C.
Gateway
- D.
Repeater
Correct Answer
A. Switch -
- 28.
What is the time a switch takes to figure out where to forward a data unit is called?
- A.
Lag
- B.
Hop
- C.
Latency
- D.
Time zone.
Correct Answer
C. Latency -
- 29.
What network device is a combination of networking hardware and software that connect two dissimilar kinds of networks?
- A.
Switch
- B.
Brouter
- C.
Gateway
- D.
Repeater
Correct Answer
C. Gateway -
- 30.
What type of gateway can restrict the kind of access LAN users have to the internet, and vice versa?
- A.
A voice/data gateway
- B.
An internet gateway
- C.
A LAN gateway
- D.
A firewall
Correct Answer
B. An internet gateway -
- 31.
What tyoe of gateway might include remote access servers that allow dial-up connectivity to a LAN?
- A.
A voice/data gateway
- B.
An internet gateway
- C.
A LAN gateway
- D.
A firewall
Correct Answer
C. A LAN gateway -
- 32.
What is a router's strength?
- A.
It's intelligence
- B.
Its quality of service
- C.
Its different interface cards
- D.
Its different types of network connectors
Correct Answer
A. It's intelligence -
- 33.
What is the oldest routing protocol?
- A.
Border Gateway Protocol
- B.
Open Shortest Path First
- C.
Routing Information Protocol
- D.
Enhanced Interior Gateway Routing Protocol
Correct Answer
C. Routing Information Protocol -
- 34.
What is the routing protocol of internet backbones?
- A.
Border Gateway Protocol
- B.
Open Shortest Path First
- C.
Routing Information Protocol
- D.
Enhanced Interior Gateway Routing Protocol
Correct Answer
A. Border Gateway Protocol -
- 35.
Based on a specific input address, which LAN switch has the lowest delay and should be considered for supporting real-time applications?
- A.
Hybrid switch
- B.
Cut-through switch
- C.
Fragment-free switch
- D.
Store and forward switch
Correct Answer
B. Cut-through switch -
- 36.
What SONET device aggregates o splits SONET traffic at various speeds so as to provide access to SONET without demultiplexing the SONET signal stream?
- A.
Add/drop multiplexer (ADM)
- B.
Drop-and-repest node (D+R)
- C.
Digital cross connect (DCS)
- D.
Digital line carrier (DLC)
Correct Answer
A. Add/drop multiplexer (ADM) -
- 37.
What topology defines the layout of a network's devices and media?
- A.
Physical
- B.
Logical
- C.
Star
- D.
Hybrid
Correct Answer
A. Physical -
- 38.
What topology consists of devices connected to a common, shared cable?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
A. Bus -
- 39.
What topology consists of cable segments from each computer connected to a centralized component?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
C. Star -
- 40.
What topology has the stations connected in the form of a circle?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
B. Ring -
- 41.
What topology combines two or more different physical topologies in a single network?
- A.
Bus
- B.
Ring
- C.
Star
- D.
Hybrid
Correct Answer
D. Hybrid -
- 42.
What is not an advantage of a logical bus topology?
- A.
There are no collisions
- B.
If a node is down, it does not bring down the entire network.
- C.
It's the most widely implemented of the logical topoligies.
- D.
Additions and changes can be made easily with affecting other workstations.
Correct Answer
A. There are no collisions -
- 43.
What is an advantage of a logical ring topology?
- A.
There are no collisions.
- B.
If a node is down, it does not bring down the entire network.
- C.
It's the most widely implemented of the logical topoligies.
- D.
Additions anc changes can be made easily without affecting other workstations.
Correct Answer
A. There are no collisions. -
- 44.
What data communication protocol use characters and symbols to govern theflow and format of information between systems?
- A.
Character-oriented
- B.
Bit-oriented
- C.
Routing
- D.
Internet
Correct Answer
A. Character-oriented -
- 45.
What data communication protocol uses character control or "handshaking" to link and represent information?
- A.
Asynchronous protocol
- B.
Binary synchronous protocol
- C.
Synchronous Data Link Control
- D.
High-Level Data Link Control
Correct Answer
B. Binary synchronous protocol -
- 46.
What data communications protocol is based on bits and the position of the bits?
- A.
Character-oriented
- B.
Bit-oriented
- C.
Routing
- D.
Internet
Correct Answer
B. Bit-oriented -
- 47.
What data comunications protocol ensures that the receiving station can distinguish information from garbage?
- A.
Asynchronous protocol
- B.
Binary synchronous protocol
- C.
Synchronous Data Link Control
- D.
High-level Data Link Control
Correct Answer
D. High-level Data Link Control -
- 48.
Which network protocol had DOD chosen as its standard to govern the flow of infortmation?
- A.
Binary Synchronous Protocol
- B.
Synchronous Data Link Control
- C.
High-Level Data Link Control
- D.
Transmission Control Protocol/internet protocol
Correct Answer
D. Transmission Control Protocol/internet protocol -
- 49.
Which TCP/IP Network layer protocol provides information about how and where data shoud be delivered, including the data's source and destination address?
- A.
Internet Protocol (IP)
- B.
Address Resolution Protocol (ARP)
- C.
Reverse Address Resolution Protocol (RARP)
- D.
Internet Control Message Protocol (ICMP)
Correct Answer
A. Internet Protocol (IP) -
- 50.
Which TCP/IP Network layer protocol provides the service of matching a known internet protocol (IP) address for a destination device to a MAC address?
- A.
IP
- B.
ARP
- C.
RARP
- D.
ICMP
Correct Answer
B. ARP -
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