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CompTIA N10-009 Practice Test 10

Question 90

A network specialist investigates this evidence: A monitoring station polls interfaces successfully but never receives unsolicited device-down notifications. Which underlying condition BEST explains the observed failure or requirement?

  1. Unauthenticated plaintext web access is permitted for sensitive sessions.
  2. SNMP traps use UDP 162 rather than poll UDP 161.
  3. Call setup signaling is separate from media transport.
  4. The requested service uses RDP rather than SSH.

Explanation

Correct Answer

B:

SNMP traps use UDP 162 rather than poll UDP 161. Polling and traps use different SNMP roles and ports.

Incorrect Answers

A:

Unauthenticated plaintext web access is permitted for sensitive sessions. That does not establish sNMP traps use UDP 162 rather than poll UDP 161.

C:

Call setup signaling is separate from media transport. That does not establish sNMP traps use UDP 162 rather than poll UDP 161.

D:

The requested service uses RDP rather than SSH. That does not establish sNMP traps use UDP 162 rather than poll UDP 161.

Question 91

A network team observes: Two Windows servers need file sharing but port 445 is blocked while HTTP is permitted. What is the MOST appropriate corrective action or technical decision?

  1. Permit appropriate DNS traffic on TCP and UDP 53 for approved resolvers.
  2. Allow only approved RDP TCP 3389 via the controlled access gateway.
  3. Allow SMB only on the explicitly approved internal host path.
  4. Enforce HTTPS over TCP 443 with valid certificates and HSTS where suitable.

Explanation

Correct Answer

C:

SMB operates over a distinct file-service port. The missing change involves allow SMB only on the explicitly approved internal host path.

Incorrect Answers

A:

Truncation and transfer scenarios can require TCP despite common UDP queries. That does not establish file-level service access for the required clients.

B:

RDP is a separate remote desktop protocol and must be tightly restricted. That does not establish file-level service access for the required clients.

D:

TLS protects the session channel against passive interception. That does not establish file-level service access for the required clients.

Question 92

A network team addresses this situation: Two Windows servers need file sharing but port 445 is blocked while HTTP is permitted. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Test RDP from approved management addresses and deny untrusted sources.
  2. Query a large signed record and verify a complete TCP retry.
  3. Inspect the transfer service port and confirm encrypted SSH session establishment.
  4. Mount the specified share from the approved client while outside hosts remain blocked.

Explanation

Correct Answer

D:

Success and isolation validate narrow file-sharing policy.

Incorrect Answers

A:

Test RDP from approved management addresses and deny untrusted sources. That check cannot demonstrate mount the specified share from the approved client while outside hosts remain blocked.

B:

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. That check cannot demonstrate mount the specified share from the approved client while outside hosts remain blocked.

C:

Successful SFTP handshake proves the intended protocol. That check cannot demonstrate mount the specified share from the approved client while outside hosts remain blocked.

Question 93

A network specialist investigates this evidence: Two Windows servers need file sharing but port 445 is blocked while HTTP is permitted. Which underlying condition BEST explains the observed failure or requirement?

  1. SMB file sharing depends on TCP 445.
  2. The requested service uses RDP rather than SSH.
  3. DNS requires TCP 53 for some responses in addition to UDP 53.
  4. SNMP traps use UDP 162 rather than poll UDP 161.

Explanation

Correct Answer

A:

SMB file sharing depends on TCP 445. SMB operates over a distinct file-service port.

Incorrect Answers

B:

The requested service uses RDP rather than SSH. The missing change involves sMB file sharing depends on TCP 445.

C:

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. The missing change involves sMB file sharing depends on TCP 445.

D:

SNMP traps use UDP 162 rather than poll UDP 161.

Question 94

A network team observes: IP phones can carry media after setup but call invitations fail because SIP signaling is filtered. What is the MOST appropriate corrective action or technical decision?

  1. Configure trap destinations and allow UDP 162 to the monitoring receiver.
  2. Permit supported SIP signaling on the configured 5060 or TLS 5061 path.
  3. Allow only approved RDP TCP 3389 via the controlled access gateway.
  4. Permit appropriate DNS traffic on TCP and UDP 53 for approved resolvers.

Explanation

Correct Answer

B:

SIP establishes calls while media uses other negotiated flows. Call setup signaling is separate from media transport.

Incorrect Answers

A:

Configuring trap destinations and allowing UDP 162 to the monitoring receiver would not permit supported SIP signaling on the configured 5060 or TLS 5061 path.

C:

Allowing only approved RDP TCP 3389 via the controlled access gateway would not permit supported SIP signaling on the configured 5060 or TLS 5061 path.

D:

Permitting appropriate DNS traffic on TCP and UDP 53 for approved resolvers would not permit supported SIP signaling on the configured 5060 or TLS 5061 path.

Question 95

A network team addresses this situation: IP phones can carry media after setup but call invitations fail because SIP signaling is filtered. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Mount the specified share from the approved client while outside hosts remain blocked.
  2. Compare clock offset before and after polling an authorized source.
  3. Place a test call and inspect invitation and response exchanges.
  4. Test RDP from approved management addresses and deny untrusted sources.

Explanation

Correct Answer

C:

Correct INVITE and successful call setup verify signaling.

Incorrect Answers

A:

Success and isolation validate narrow file-sharing policy. That check cannot demonstrate place a test call and inspect invitation and response exchanges.

B:

Compare clock offset before and after polling an authorized source. That check cannot demonstrate place a test call and inspect invitation and response exchanges.

D:

Test RDP from approved management addresses and deny untrusted sources. That check cannot demonstrate place a test call and inspect invitation and response exchanges.

Question 96

A network specialist investigates this evidence: IP phones can carry media after setup but call invitations fail because SIP signaling is filtered. Which underlying condition BEST explains the observed failure or requirement?

  1. SNMP traps use UDP 162 rather than poll UDP 161.
  2. The requested service uses RDP rather than SSH.
  3. SMB file sharing depends on TCP 445.
  4. Call setup signaling is separate from media transport.

Explanation

Correct Answer

D:

Call setup signaling is separate from media transport. SIP establishes calls while media uses other negotiated flows.

Incorrect Answers

A:

SNMP traps use UDP 162 rather than poll UDP 161. The missing change involves call setup signaling is separate from media transport.

B:

The requested service uses RDP rather than SSH. That does not establish call setup signaling is separate from media transport.

C:

SMB operates over a distinct file-service port. That does not establish call setup signaling is separate from media transport.

Question 97

A network team observes: A 12 km campus fiber run fails using short-range multimode optics despite good connectors. What is the MOST appropriate corrective action or technical decision?

  1. Select compatible single-mode fiber and long-reach optical modules with correct wavelengths.
  2. Replace the patch cord with a properly keyed LC-to-LC cable for these ports.
  3. Certify the copper run and replace cable failing the required category or resistance checks.
  4. Select supported twinax direct-attach copper with matching transceiver ends.

Explanation

Correct Answer

A:

Single-mode optics are designed for longer distances than typical short-reach multimode links. Optical media and transceivers do not support the required reach.

Incorrect Answers

B:

Replacing the patch cord with a properly keyed LC-to-LC cable for these ports would not meet the need for compatible single-mode fiber and long-reach optical modules with correct wavelengths.

C:

Certify the copper run and replace cable failing the required category or resistance checks would not meet the need for compatible single-mode fiber and long-reach optical modules with correct wavelengths.

D:

Selecting supported twinax direct-attach copper with matching transceiver ends would not meet the need for compatible single-mode fiber and long-reach optical modules with correct wavelengths.

Question 98

A network team addresses this situation: A 12 km campus fiber run fails using short-range multimode optics despite good connectors. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inspect end faces and confirm insertion and optical link state.
  2. Measure link margin and error rate over the full path.
  3. Measure voltage under peak AP load and run cable qualification.
  4. Confirm compatible port speeds and sustained error-free traffic.

Explanation

Correct Answer

B:

An acceptable optical budget and error rate validate reach.

Incorrect Answers

A:

Connector fit and received light validate the patch. It does not measure link margin and error rate over the full path.

C:

Load test reveals power-delivery loss absent at idle. It does not measure link margin and error rate over the full path.

D:

Negotiated high-speed transfer validates the short DAC link. It does not measure link margin and error rate over the full path.

Question 99

A network specialist investigates this evidence: A 12 km campus fiber run fails using short-range multimode optics despite good connectors. Which underlying condition BEST explains the observed failure or requirement?

  1. Connector form factors differ even with compatible optical wavelengths.
  2. A short-reach direct attach option can meet the link requirement.
  3. Optical media and transceivers do not support the required reach.
  4. Cable loss or conductor condition prevents stable delivered power.

Explanation

Correct Answer

C:

Optical media and transceivers do not support the required reach. Single-mode optics are designed for longer distances than typical short-reach multimode links.

Incorrect Answers

A:

Optical transceiver compatibility and receive-light measurements diagnose the physical signal path before higher-layer work.

B:

A short-reach direct attach option can meet the link requirement. That does not establish restoration and verification of received optical light.

D:

Cable loss or conductor condition prevents stable delivered power. That does not establish restoration and verification of received optical light.

Question 100

A network team observes: A short server-room fiber link uses long-reach single-mode optics against multimode cabling and cannot establish a link. What is the MOST appropriate corrective action or technical decision?

  1. Select supported twinax direct-attach copper with matching transceiver ends.
  2. Replace the patch cord with a properly keyed LC-to-LC cable for these ports.
  3. Use a manufacturer-supported QSFP module and matching link endpoints.
  4. Match multimode-rated transceivers and fibers at both endpoints.

Explanation

Correct Answer

D:

Both endpoints must agree on supported optics and media. The installed optic type is incompatible with the fiber.

Incorrect Answers

A:

Selecting supported twinax direct-attach copper with matching transceiver ends would not match multimode-rated transceivers and fibers at both endpoints.

B:

Replacing the patch cord with a properly keyed LC-to-LC cable for these ports would not match multimode-rated transceivers and fibers at both endpoints.

C:

Using a manufacturer-supported QSFP module and matching link endpoints would not match multimode-rated transceivers and fibers at both endpoints.


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