ESTUDYR
COMPTIA NETWORK+ TROUBLESHOOTING
BUNDLED EXAMS
Network Pro Ch 9.2 –
Focuses on network troubleshooting procedures, using structured methods (identify, establish
theory, test, implement, verify, document).
Network+ Domain 4: Troubleshooting –
Covers the CompTIA Network+ Domain 4 objectives, including troubleshooting tools,
methodologies, and common network issues (connectivity, performance, hardware, cabling).
Part 3 Network Exam –
Likely a sectional practice test assessing troubleshooting and configuration knowledge across
multiple topics.
10.7.9 Practice Exam –
A hands-on or simulation-based practice exam designed to test Network+ troubleshooting
skills (IP addressing, VLANs, wireless, routing).
CompTIA Network+ Certification –
The main certification validating network installation, configuration, management, and
troubleshooting skills.
CompTIA Network+ Certification Practice Test 1 –
A mock exam simulating the real CompTIA Network+ test environment, focusing on core
networking concepts.
CompTIA Network+ Certification Practice Test 3 –
An advanced practice test, emphasizing scenario-based and performance-based
troubleshooting questions.
1. Which of the following protocols are used with VoIP? (Select two.)
A. SIP (Correct)
B. FTP
C. RTP (Correct)
D. SMTP
,ESTUDYR
Rationale: SIP handles signaling (call setup/teardown); RTP carries the real-time
audio/video media.
2. Which protocol is used by VoIP to set up, maintain, and terminate phone calls?
A. RTP
B. MGCP
C. SIP (Correct)
D. DHCP
Rationale: SIP (Session Initiation Protocol) is the signaling protocol for establishing
multimedia sessions.
3. Which switch features are typically used with VoIP deployments? (Select two.)
A. STP
B. PoE (Correct)
C. VLAN (Correct)
D. BGP
Rationale: PoE powers IP phones through switch ports; VLANs separate voice traffic for
QoS and security.
4. Which feature supplies power to IP phones through a switch port?
A. VLAN
B. PoE (Power over Ethernet) (Correct)
C. STP
D. LLDP
Rationale: PoE provides DC power over Ethernet cabling to compatible devices like IP
phones.
5. Match UC component to definition: UC Server —
A. Connects UC network to PSTN
B. Manages the entire UC system (Correct)
C. An IP phone hardware device
D. A smartphone client
Rationale: The UC server orchestrates services like call control, presence, and
messaging.
6. Match UC component: UC Gateway —
A. Manages presence information
B. Connects a digital/UC network to the PSTN or analog network (Correct)
C. An IP desk phone
D. A UC software client
,ESTUDYR
Rationale: Gateways translate signaling/media between UC/IP networks and
PSTN/analog circuits.
7. Match UC component: UC Hardware Device —
A. A smartphone client
B. UC server software
C. An IP phone designed to work with UC server (Correct)
D. A gateway
Rationale: UC hardware devices include IP phones or dedicated endpoints built for UC
systems.
8. Match UC component: UC Software Device —
A. An IP desk phone
B. A smartphone or softphone application used to access UC services (Correct)
C. PSTN gateway
D. Presence server
Rationale: UC software clients run on computers/phones to access UC features (voice,
IM, presence).
9. Employees report unusual sound effects on VoIP calls (clicks/gaps/distortion). Which
problem is this?
A. Latency
B. Packet duplication
C. Jitter (Correct)
D. Security attack
Rationale: Jitter is variation in packet arrival times, causing audible artifacts unless
mitigated by jitter buffers.
10. At approximately what percent packet loss does voice quality become noticeable?
A. 0.01%
B. 0.1%
C. 1% (Correct)
D. 10%
Rationale: Even ~1% packet loss can degrade real-time voice quality; higher loss is more
disruptive.
11. Which protocol does VoIP commonly use to interface with the PSTN (call control from
gateway/controller)?
A. SIP
B. H.323
, ESTUDYR
C. MGCP (Correct)
D. RTP
Rationale: MGCP (Media Gateway Control Protocol) controls PSTN gateways; SIP/H.323
may also interwork but MGCP is for gateway control.
12. A UC deployment enables users to publish their availability status. This is called:
A. Presence server
B. Activity logging
C. Presence information (Correct)
D. Directory service
Rationale: Presence indicates user availability (available, busy, in a call) to other UC
clients.
13. Which system integrates phone calls, email, and IM into a single platform?
A. CRM
B. PBX
C. Unified Communications (UC) (Correct)
D. ERP
Rationale: UC converges multiple communication modalities into one integrated
platform.
14. Which protocol is used during call control for multimedia communications (call
setup)?
A. Session Initiation Protocol (SIP) (Correct)
B. RTP
C. RTCP
D. FTP
Rationale: SIP handles negotiation, setup, modification, and teardown of multimedia
sessions.
Troubleshooting Methodology (stepwise & scenarios)
15. You receive a frantic report "nothing is working." What is the first step in
troubleshooting?
A. Immediately reboot systems
B. Establish the symptoms (Correct)
C. Change configurations randomly
D. Escalate to manager
Rationale: First identify and define the problem before hypothesizing solutions.
COMPTIA NETWORK+ TROUBLESHOOTING
BUNDLED EXAMS
Network Pro Ch 9.2 –
Focuses on network troubleshooting procedures, using structured methods (identify, establish
theory, test, implement, verify, document).
Network+ Domain 4: Troubleshooting –
Covers the CompTIA Network+ Domain 4 objectives, including troubleshooting tools,
methodologies, and common network issues (connectivity, performance, hardware, cabling).
Part 3 Network Exam –
Likely a sectional practice test assessing troubleshooting and configuration knowledge across
multiple topics.
10.7.9 Practice Exam –
A hands-on or simulation-based practice exam designed to test Network+ troubleshooting
skills (IP addressing, VLANs, wireless, routing).
CompTIA Network+ Certification –
The main certification validating network installation, configuration, management, and
troubleshooting skills.
CompTIA Network+ Certification Practice Test 1 –
A mock exam simulating the real CompTIA Network+ test environment, focusing on core
networking concepts.
CompTIA Network+ Certification Practice Test 3 –
An advanced practice test, emphasizing scenario-based and performance-based
troubleshooting questions.
1. Which of the following protocols are used with VoIP? (Select two.)
A. SIP (Correct)
B. FTP
C. RTP (Correct)
D. SMTP
,ESTUDYR
Rationale: SIP handles signaling (call setup/teardown); RTP carries the real-time
audio/video media.
2. Which protocol is used by VoIP to set up, maintain, and terminate phone calls?
A. RTP
B. MGCP
C. SIP (Correct)
D. DHCP
Rationale: SIP (Session Initiation Protocol) is the signaling protocol for establishing
multimedia sessions.
3. Which switch features are typically used with VoIP deployments? (Select two.)
A. STP
B. PoE (Correct)
C. VLAN (Correct)
D. BGP
Rationale: PoE powers IP phones through switch ports; VLANs separate voice traffic for
QoS and security.
4. Which feature supplies power to IP phones through a switch port?
A. VLAN
B. PoE (Power over Ethernet) (Correct)
C. STP
D. LLDP
Rationale: PoE provides DC power over Ethernet cabling to compatible devices like IP
phones.
5. Match UC component to definition: UC Server —
A. Connects UC network to PSTN
B. Manages the entire UC system (Correct)
C. An IP phone hardware device
D. A smartphone client
Rationale: The UC server orchestrates services like call control, presence, and
messaging.
6. Match UC component: UC Gateway —
A. Manages presence information
B. Connects a digital/UC network to the PSTN or analog network (Correct)
C. An IP desk phone
D. A UC software client
,ESTUDYR
Rationale: Gateways translate signaling/media between UC/IP networks and
PSTN/analog circuits.
7. Match UC component: UC Hardware Device —
A. A smartphone client
B. UC server software
C. An IP phone designed to work with UC server (Correct)
D. A gateway
Rationale: UC hardware devices include IP phones or dedicated endpoints built for UC
systems.
8. Match UC component: UC Software Device —
A. An IP desk phone
B. A smartphone or softphone application used to access UC services (Correct)
C. PSTN gateway
D. Presence server
Rationale: UC software clients run on computers/phones to access UC features (voice,
IM, presence).
9. Employees report unusual sound effects on VoIP calls (clicks/gaps/distortion). Which
problem is this?
A. Latency
B. Packet duplication
C. Jitter (Correct)
D. Security attack
Rationale: Jitter is variation in packet arrival times, causing audible artifacts unless
mitigated by jitter buffers.
10. At approximately what percent packet loss does voice quality become noticeable?
A. 0.01%
B. 0.1%
C. 1% (Correct)
D. 10%
Rationale: Even ~1% packet loss can degrade real-time voice quality; higher loss is more
disruptive.
11. Which protocol does VoIP commonly use to interface with the PSTN (call control from
gateway/controller)?
A. SIP
B. H.323
, ESTUDYR
C. MGCP (Correct)
D. RTP
Rationale: MGCP (Media Gateway Control Protocol) controls PSTN gateways; SIP/H.323
may also interwork but MGCP is for gateway control.
12. A UC deployment enables users to publish their availability status. This is called:
A. Presence server
B. Activity logging
C. Presence information (Correct)
D. Directory service
Rationale: Presence indicates user availability (available, busy, in a call) to other UC
clients.
13. Which system integrates phone calls, email, and IM into a single platform?
A. CRM
B. PBX
C. Unified Communications (UC) (Correct)
D. ERP
Rationale: UC converges multiple communication modalities into one integrated
platform.
14. Which protocol is used during call control for multimedia communications (call
setup)?
A. Session Initiation Protocol (SIP) (Correct)
B. RTP
C. RTCP
D. FTP
Rationale: SIP handles negotiation, setup, modification, and teardown of multimedia
sessions.
Troubleshooting Methodology (stepwise & scenarios)
15. You receive a frantic report "nothing is working." What is the first step in
troubleshooting?
A. Immediately reboot systems
B. Establish the symptoms (Correct)
C. Change configurations randomly
D. Escalate to manager
Rationale: First identify and define the problem before hypothesizing solutions.
