Download Implementing Cisco Collaboration Cloud and Edge Solutions.300-820.ExamTopics.2025-05-31.181q.vcex

Vendor: Cisco
Exam Code: 300-820
Exam Name: Implementing Cisco Collaboration Cloud and Edge Solutions
Date: May 31, 2025
File Size: 6 MB
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Demo Questions

Question 1
Which complication does a NAT introduce in SDP for a SIP call?
  1. Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
  2. When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
  3. The IP address specified in the connection data field may be an unrouteable internal address.
  4. The encryption keys advertised in the SDP are only valid for clients not behind a NAT.
Correct answer: C
Question 2
An organization with a domain name of example.com.
Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)
  1. _sips._tcp.example.com
  2. _sips._udp.example.com
  3. _h323ls._udp.example com
  4. _h323ls._tcp.example.com
  5. _collab-edge._tls.example.com
Correct answer: AC
Question 3
When the network requirements are configured for a new Video Mesh deployment, which firewall ports are required so that Video Mesh cascade signaling succeeds?
  1. TCP 443 and 444
  2. TCP 443 and 8443
  3. UDP 5004 and 5005
  4. UDP 33432 through 33433
Correct answer: B
Question 4
Which 16-digit number is unique to a serial number and is used to enable the system?
  1. RMS license key
  2. option key
  3. release key
  4. Expressway series
Correct answer: C
Question 5
Refer to the exhibit. What are “Type” field values for this Expressway servers zone configuration?
  1. Expressway-C “DNS”, Expressway-E “Traversal server”
  2. Expressway-C “Traversal server”, Expressway-E “Traversal client”
  3. Expressway-C “Neighbor”, Expressway-E “Neighbor”
  4. Expressway-C “Traversal client”, Expressway-E “Traversal server”
Correct answer: D
Question 6
An engineer reviews the configuration of a pair of Expressway servers for a company with the domain example.com. The company allows toll fraud calls to reach the Cisco UCM only when it expects externally registered devices to call internal 5-digit extensions. The search history shows that the fraudulent calls have a destination URI of 8 or more digits and several domains. What must the engineer configure to prevent all toll fraud calls from going past the Expressway-E to the internal network?
  1. search rules to only route calls with a destination URI of 5 to 8 digits long on the Expressway-E
  2. CPL that blocks calls with a destination domain other than example.com on the Expressway-C.
  3. search rules to only route calls with a destination domain of example.com on the Expressway-E
  4. CPL to block calls with a destination URI with 8 or more digits on the Expressway-E
Correct answer: D
Question 7
Which two internal SIP endpoints behind a firewall place calls to external devices? (Choose two.)
  1. An Expressway-C communicates with the internal endpoint and forwards the media to and from an Expressway-E.
  2. A Cisco Endpoint is configured with a publicly routable static NAT SIP address to advertise instead of is private IP address.
  3. An Expressway-C communicates directly with the remote party using the ICE protocol
  4. An Expressway-E is used as a VPN server to allow remote SIP edge servers to connect calls
  5. An Expressway-C rewrites the SIP SDP to advertise its own IP address to the external party.
Correct answer: AB
Question 8
Which mechanism does TLS use to validate identity?
  1. server certificate
  2. shared secret
  3. username and a password
  4. IP address of the peer
Correct answer: A
Question 9
An engineer is investigating failing incoming calls that are expected to connect. The engineer notices that the failed calls all have a port number of 5060 at the end of the URI. The search rules are configured in a way that they do not expect a port to be included. Which configuration allows the routing of this call?
  1. * transform with a pattern string of *(.*)@example.com(:5060)?"
    * replace a suing of \[email protected]
  2. * search rule with a pattern string of “(.*)@example.com(:5050)?"
    * replace a string of \1\2@example com
  3. search rule with a pattern string of “(.*)@example.com(:5060)?"
    * replace a string of \[email protected]\2
  4. * transform with a pattern string of “(.*)@example.com(:5060)?"
    * replace a string of \[email protected]\2
Correct answer: A
Question 10
Refer to the exhibit. Call policy rules on an Expressway-E prevent external callers from the internet from calling a VIP whose URI is [email protected]. Which additional configuration setting is required for this call policy to function as intended?
  1. The default zone on the Expressway-E must not be configured to treat as authenticated.
  2. A search rule must be configured with an extract match for [email protected] to pass the call to the Expressway-C.
  3. The Cisco TelePresence endpoint registered with the URI [email protected] must be set in “do not disturb” mode.
  4. SIP TLS must be disabled on the Expressway-E.
Correct answer: A
Question 11
An engineer configures a Cisco Collaboration environment to use Mobile and Remote Access for external access for company users. The engineer uses OAuth with refresh on the Cisco UCM SIP lines for extra security and improved user experience. During the setup, Mobile and Remote Access does not work, it is enabled on the Cisco UCM and Cisco Expressways. SIP trunks on ports 5090 and 5091 are configured to avoid conflicts with other SIP trunks between internal Cisco UCM clusters. The traversal zone also uses port 6500. The traversal zone between Expressways shows no errors, and the requests hit Expressway-E from the Internet. What is the reason that the solution does not work?
  1. Mobile and Remote Access does not support OAuth with refresh with this configuration,
  2. The default port for Mobile and Remote Access is 6001. Therefore, the traversal port must be port 6001 for Mobile and Remote Access to work.
  3. The default port for Mobile and Remote Access is 6500, which creates a conflict with the existing traversal zone port.
  4. The default port for Mobile and Remote Access is 5091, which creates a conflict with the existing SIP trunks.
Correct answer: D
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