A Cisco IP phone is not registering. The phone displays 'Network Link is Down'. Which network connectivity issue is most likely the cause?

The phone's network cable is unplugged or faulty.

The phone's IP address is incorrect.

The phone's VLAN is misconfigured.

The phone cannot reach the TFTP server.

A company has two CUCM clusters: one for the headquarters and one for a remote site. The remote site's phones are configured to use DNS for TFTP discovery. The DNS server has an SRV record for _cisco-phone._tcp that points to the headquarters TFTP server. The remote site's phones fail to register. The phones can ping the headquarters TFTP server. What is the most likely cause?

The phones' firmware is incompatible with the remote site's CUCM.

The phones' digest credentials are incorrect for the remote site's CUCM.

The remote site's CUCM is not reachable from the phones.

The SRV record points to the wrong TFTP server, so the phones are downloading the wrong configuration file.

A Cisco 8841 phone fails to register. The phone displays 'Registering' and then 'Configuring IP'. You suspect a network issue. Which diagnostic tool would provide the most direct evidence of whether the phone's registration messages are reaching the CUCM server?

Run a packet capture on the phone's access port and filter for SIP messages.

Review the phone's TFTP configuration file.

Verify the phone's firmware version.

Check the phone's DHCP lease information.

Several phones in a new office cannot register. They receive IP addresses from DHCP, but the phones show 'No Service' and cannot ping the CUCM server's IP address. The switch ports are configured as access ports with the correct voice VLAN. What should you check next?

Check that the phone's firmware is compatible with the CUCM version.

Confirm that the phones are using the correct DNS server for SRV lookups.

Verify that the voice VLAN is allowed on the trunk ports between the access switch and the distribution switch.

Ensure that the CUCM server's certificate is trusted by the phone.

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Domain 2Objective 3

2.3 Troubleshoot Endpoint Registration 350-801 Practice Questions (Page 4)

Part of the Protocols and Endpoints domain, which accounts for 10% of the 350-801 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~5–8 in this domain), expect 2–3 from this objective — we provide 31 practice questions to prepare you well beyond it. (estimate)

31questions here

7free pages

9concepts

10%of the exam

Questions 16–20

16foundation · easy
A Cisco IP phone is not registering. The phone displays 'Network Link is Down'. Which network connectivity issue is most likely the cause?
Select an answer first
17expert · hard
A company has two CUCM clusters: one for the headquarters and one for a remote site. The remote site's phones are configured to use DNS for TFTP discovery. The DNS server has an SRV record for _cisco-phone._tcp that points to the headquarters TFTP server. The remote site's phones fail to register. The phones can ping the headquarters TFTP server. What is the most likely cause?
Select an answer first
18application · medium
A Cisco 8841 phone fails to register. The phone displays 'Registering' and then 'Configuring IP'. You suspect a network issue. Which diagnostic tool would provide the most direct evidence of whether the phone's registration messages are reaching the CUCM server?
Select an answer first
19application · medium
Several phones in a new office cannot register. They receive IP addresses from DHCP, but the phones show 'No Service' and cannot ping the CUCM server's IP address. The switch ports are configured as access ports with the correct voice VLAN. What should you check next?
Select an answer first
20foundation · easy
A Cisco IP phone gets an IP address but cannot register. The administrator suspects a routing issue. Which command should the administrator use on the phone to verify connectivity to the CUCM server?
Select an answer first

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2.3 Troubleshoot Endpoint Registration 350-801 Practice Questions (Page 4)

Questions 16–20

A Cisco IP phone is not registering. The phone displays 'Network Link is Down'. Which network connectivity issue is most likely the cause?

A Cisco 8841 phone fails to register. The phone displays 'Registering' and then 'Configuring IP'. You suspect a network issue. Which diagnostic tool would provide the most direct evidence of whether the phone's registration messages are reaching the CUCM server?

Several phones in a new office cannot register. They receive IP addresses from DHCP, but the phones show 'No Service' and cannot ping the CUCM server's IP address. The switch ports are configured as access ports with the correct voice VLAN. What should you check next?

A Cisco IP phone gets an IP address but cannot register. The administrator suspects a routing issue. Which command should the administrator use on the phone to verify connectivity to the CUCM server?

Keep studying — Protocols and Endpoints