NCTI FINAL EXAM: PROGRESSION
FIELD TECH 3- 4 TEST EXAM|
LATEST UPDATE |
Verified Answers Progression:
Field Tech III - IV Conventional
500Q/A
Course
NCTI
1. The OSI Network Layer primarily performs which function?
A. Error detection
B. Routing packets between networks
C. Formatting data
D. Encryption
Answer: B. Routing packets between networks
Rationale:
The Network Layer (Layer 3) uses logical addressing and routing to move packets between
different networks.
2. What is the purpose of the OSI Application Layer?
A. Physical transmission of signals
B. Defines application communications and services
C. Packet routing
D. Error correction
Answer: B. Defines application communications and services
Rationale:
The Application Layer provides network services directly to end-user applications such as web
browsers and email clients.
3. Which IP address class does 68.56.189.17 belong to?
A. Class A
B. Class B
,C. Class C
D. Class D
Answer: A. Class A
Rationale:
Class A addresses have a first octet range of 1–126. Since 68 falls within this range, it is a Class
A address.
4. What happens when data is sent to a 127.x.x.x address?
A. Sent to the internet
B. Routed through the default gateway
C. Loopback to the local computer
D. Sent to DNS
Answer: C. Loopback to the local computer
Rationale:
The 127.0.0.0/8 network is reserved for loopback testing and local host communications.
5. Why might a workstation show multiple TCP connections to the same web server?
A. Network error
B. Multiple HTTP sessions and objects being loaded simultaneously
C. IP conflict
D. DNS failure
Answer: B. Multiple HTTP sessions and objects being loaded simultaneously
Rationale:
Web browsers commonly open several TCP sessions to download page elements such as images,
scripts, and stylesheets.
6. What is the main benefit of WDM (Wavelength Division Multiplexing)?
A. Reduces fiber count
B. Increases capacity over existing fiber infrastructure
C. Eliminates amplifiers
D. Reduces optical power
Answer: B. Increases capacity over existing fiber infrastructure
, Rationale:
WDM allows multiple wavelengths to travel over the same fiber, significantly increasing
bandwidth capacity.
7. What is unique about WDM-PON architecture?
A. Shared wavelength among all users
B. Each subscriber can receive a dedicated wavelength
C. Uses coax only
D. Requires no optical equipment
Answer: B. Each subscriber can receive a dedicated wavelength
Rationale:
WDM-PON assigns unique wavelengths to subscribers, improving scalability and bandwidth.
8. Which DOCSIS device communicates directly with the CMTS?
A. Splitter
B. Cable modem
C. Optical node
D. Tap
Answer: B. Cable modem
Rationale:
The cable modem establishes communication with the CMTS to provide internet connectivity.
9. What does CMTS stand for?
A. Cable Modem Termination System
B. Customer Modem Tracking System
C. Cable Media Transfer Service
D. Customer Media Terminal System
Answer: A. Cable Modem Termination System
Rationale:
A CMTS is located at the headend and manages communications with cable modems.
10. Which instrument is commonly used to measure optical power in a fiber network?
FIELD TECH 3- 4 TEST EXAM|
LATEST UPDATE |
Verified Answers Progression:
Field Tech III - IV Conventional
500Q/A
Course
NCTI
1. The OSI Network Layer primarily performs which function?
A. Error detection
B. Routing packets between networks
C. Formatting data
D. Encryption
Answer: B. Routing packets between networks
Rationale:
The Network Layer (Layer 3) uses logical addressing and routing to move packets between
different networks.
2. What is the purpose of the OSI Application Layer?
A. Physical transmission of signals
B. Defines application communications and services
C. Packet routing
D. Error correction
Answer: B. Defines application communications and services
Rationale:
The Application Layer provides network services directly to end-user applications such as web
browsers and email clients.
3. Which IP address class does 68.56.189.17 belong to?
A. Class A
B. Class B
,C. Class C
D. Class D
Answer: A. Class A
Rationale:
Class A addresses have a first octet range of 1–126. Since 68 falls within this range, it is a Class
A address.
4. What happens when data is sent to a 127.x.x.x address?
A. Sent to the internet
B. Routed through the default gateway
C. Loopback to the local computer
D. Sent to DNS
Answer: C. Loopback to the local computer
Rationale:
The 127.0.0.0/8 network is reserved for loopback testing and local host communications.
5. Why might a workstation show multiple TCP connections to the same web server?
A. Network error
B. Multiple HTTP sessions and objects being loaded simultaneously
C. IP conflict
D. DNS failure
Answer: B. Multiple HTTP sessions and objects being loaded simultaneously
Rationale:
Web browsers commonly open several TCP sessions to download page elements such as images,
scripts, and stylesheets.
6. What is the main benefit of WDM (Wavelength Division Multiplexing)?
A. Reduces fiber count
B. Increases capacity over existing fiber infrastructure
C. Eliminates amplifiers
D. Reduces optical power
Answer: B. Increases capacity over existing fiber infrastructure
, Rationale:
WDM allows multiple wavelengths to travel over the same fiber, significantly increasing
bandwidth capacity.
7. What is unique about WDM-PON architecture?
A. Shared wavelength among all users
B. Each subscriber can receive a dedicated wavelength
C. Uses coax only
D. Requires no optical equipment
Answer: B. Each subscriber can receive a dedicated wavelength
Rationale:
WDM-PON assigns unique wavelengths to subscribers, improving scalability and bandwidth.
8. Which DOCSIS device communicates directly with the CMTS?
A. Splitter
B. Cable modem
C. Optical node
D. Tap
Answer: B. Cable modem
Rationale:
The cable modem establishes communication with the CMTS to provide internet connectivity.
9. What does CMTS stand for?
A. Cable Modem Termination System
B. Customer Modem Tracking System
C. Cable Media Transfer Service
D. Customer Media Terminal System
Answer: A. Cable Modem Termination System
Rationale:
A CMTS is located at the headend and manages communications with cable modems.
10. Which instrument is commonly used to measure optical power in a fiber network?
