CLCOR Protocols And Endpoints Practice Test 2 — 15 Questions

Question 1

When a SIP phone initiates a call, which message does the CUCM send to acknowledge the initial INVITE?

Accepted Answer

100 Trying. A '100 Trying' message is the standard response to indicate that the INVITE has been received and is being processed.

Answer

401 Unauthorized

Answer

180 Ringing

Answer

200 OK

Question 2

You have a requirement to use secure signaling for SIP endpoints. Which protocol and port combination must be used in the SIP Security Profile?

Accepted Answer

SIP TLS 5061. SIPS (SIP over TLS) uses port 5061 to ensure encrypted signaling.

Answer

HTTP 443

Answer

SIP TCP 5060

Answer

SRTP 5061

Question 3

Which field in the SIP INVITE SDP body specifies the media attributes such as codec type?

Accepted Answer

m= line. The 'm=' (media) line specifies the media type, port, protocol, and codec information.

Answer

o= line

Answer

c= line

Answer

s= line

Question 4

An IP phone is stuck in a boot loop. You suspect a corrupted firmware image. Which process would you initiate to force the phone to download a new image?

Accepted Answer

Factory Reset. Performing a 'Factory Reset' or updating the 'Load Information' in the Device configuration in CUCM will trigger a forced update.

Answer

Restart Device

Answer

Refresh CTI

Answer

Reset SIP Profile

Question 5

Which protocol provides the signaling for Webex Room devices when they are registered to CUCM (on-premises)?

Accepted Answer

SIP. Webex Room devices can use SIP to register to on-premises CUCM systems.

Answer

MGCP

Answer

SCCP

Answer

H.323

Question 6

Which TWO protocols are used for managing the quality and monitoring of VoIP sessions?

Accepted Answer

RTCP. RTCP is used for quality feedback, and SNMP or various management protocols are used for monitoring.

Answer

TFTP

Answer

SIP

Answer

RTP

Question 7

Which THREE codecs are natively supported by the Cisco IP Phone 8800 series?

Accepted Answer

Opus. G.711, G.729, and Opus/G.722 are widely supported across the 8800 series.

Answer

H.264

Answer

G.723

Question 8

To ensure that G.729 is used for all inter-site calls but G.711 is used for intra-site calls, what specific CUCM construct must you define?

Accepted Answer

Region Relationship. You must define Regions and then assign the 'Region Relationship' to dictate the codec allowed between those regions.

Answer

Location

Answer

Device Pool

Answer

Transcoder

Question 9

You are troubleshooting a registration issue where the phone sends a REGISTER request, but the server does not respond. What is the most likely issue?

Accepted Answer

Network Connectivity/Firewall. If the phone sends a request and gets no response, it is a reachability or network path issue (firewall/ACL).

Answer

Incorrect Model

Answer

Device Pool mismatch

Answer

Wrong Password

Question 10

Which TWO tasks must be performed when moving a phone from one CUCM cluster to another?

Accepted Answer

Reset the phone. You must change the TFTP server address and potentially reset the device to clear the old registration data.

Answer

Enable SIP OPTIONS

Answer

Update the CTI Manager

Answer

Delete the phone from AD

Question 11

Which THREE methods are used by Cisco IP phones to obtain their configuration files?

Accepted Answer

Auto-discovery via Service Discovery. DHCP options, manual entry, and auto-discovery/TFTP are standard methods.

Answer

SMTP

Answer

FTP

Question 12

Which THREE items are included in a standard SIP REGISTER request?

Accepted Answer

To Header. The 'To', 'From', and 'Contact' headers are mandatory in a SIP REGISTER request.

Answer

Alert-Info

Answer

Body (SDP)

Question 13

Which TWO features are provided by the Cisco Webex App when registered as a Softphone?

Accepted Answer

SIP signaling. Webex provides softphone signaling (SIP) and audio/video media capabilities.

Answer

TFTP service hosting

Answer

DNS root server

Answer

DHCP server functionality

Question 14

Which THREE network conditions contribute to poor VoIP call quality in an RTP stream?

Accepted Answer

Latency. Latency, jitter, and packet loss are the primary enemies of voice quality.

Answer

High MTU

Answer

Fast switching

Question 15

Which TWO factors significantly impact the choice of audio codec during a call setup in CUCM?

Accepted Answer

Codec Preference List. Bandwidth availability (Regions) and codec preference (Codec List) are the main determinants.

Answer

DNS Server

Answer

VLAN ID

Answer

NTP Server