300-820 practice questions 91–100

1. Question 91 · 177 in bank

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   Cisco Jabber clients are failing to log in using Mobile and Remote Access. The administrator checked the Jabber problem report logs and saw that connections to the Expressway-E are being refused on TCP port 8443. From a packet capture run on the Jabber client while attempting to log in, there is no response to the TCP SYN packets sent to the Expressway-E by Jabber. Which two reasons are causing the Expressway-E to be unreachable on port 8443 from the internet? (Choose two.)

   • AThe Jabber clients using an outdated version.
   • BThe Unified Communications zone is down.
   • CThe firewall is blocking the port.
   • DThe certificate for Jabber is expired.
   • EThe SRV record for _cisco-uds is misconfigured.

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   Answer: CE

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2. Question 92 · 177 in bank

   An organization wants to be able to call IP addresses and URI addresses. An engineer must configure Cisco Expressways to manage this request from the endpoints in the organization. How would the engineer configure the Expressways to allow these calls to be completed to external IP addresses?

   • ASet calls to unknown IP addresses to direct on the Cisco Expressways, and add a search rule on the Expressway-E
   • BSet calls to unknown IP addresses to indirect on the Cisco Expressways, and add a search rule on the Expressway-E
   • CUse search rules to manage calls to IP addresses, and the direct/indirect setting on the Expressway is used as a fallback only if the search rules do not exist
   • DSet calls to unknown IP addresses to indirect on the Expressway-C and direct on the Expressway-E, and add a search rule on the Expressway-E

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   Answer: D

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3. Question 93 · 177 in bank

   When the network requirements are configured for a new Video Mesh deployment, which firewall ports are required so that Video Mesh cascade signaling succeeds?

   • ATCP 443 and 444
   • BTCP 443 and 8443
   • CUDP 5004 and 5005
   • DUDP 33432 through 33433

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   Answer: B

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4. Question 94 · 177 in bank

   Which 16-digit number is unique to a serial number and is used to enable the system?

   • ARMS license key
   • Boption key
   • Crelease key
   • DExpressway series

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   Answer: C

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5. Question 95 · 177 in bank

   

   Refer to the exhibit. What are “Type” field values for this Expressway servers zone configuration?

   • AExpressway-C “DNS”, Expressway-E “Traversal server”
   • BExpressway-C “Traversal server”, Expressway-E “Traversal client”
   • CExpressway-C “Neighbor”, Expressway-E “Neighbor”
   • DExpressway-C “Traversal client”, Expressway-E “Traversal server”

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   Answer: D

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6. Question 96 · 177 in bank

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   Which two internal SIP endpoints behind a firewall place calls to external devices? (Choose two.)

   • AAn Expressway-C communicates with the internal endpoint and forwards the media to and from an Expressway-E.
   • BA Cisco Endpoint is configured with a publicly routable static NAT SIP address to advertise instead of is private IP address.
   • CAn Expressway-C communicates directly with the remote party using the ICE protocol
   • DAn Expressway-E is used as a VPN server to allow remote SIP edge servers to connect calls
   • EAn Expressway-C rewrites the SIP SDP to advertise its own IP address to the external party.

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   Answer: AB

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7. Question 97 · 177 in bank

   Which mechanism does TLS use to validate identity?

   • Aserver certificate
   • Bshared secret
   • Cusername and a password
   • DIP address of the peer

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   Answer: A

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8. Question 98 · 177 in bank

   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?

   • A* transform with a pattern string of *(.*)@example.com(:5060)?" * replace a suing of \[email protected]
   • B* search rule with a pattern string of “(.*)@example.com(:5050)?" * replace a string of \1\2@example com
   • Csearch rule with a pattern string of “(.*)@example.com(:5060)?" * replace a string of \[email protected]\2
   • D* transform with a pattern string of “(.*)@example.com(:5060)?" * replace a string of \[email protected]\2

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   Answer: A

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9. Question 99 · 177 in bank

   

   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?

   • AThe default zone on the Expressway-E must not be configured to treat as authenticated.
   • BA search rule must be configured with an extract match for [email protected] to pass the call to the Expressway-C.
   • CThe Cisco TelePresence endpoint registered with the URI [email protected] must be set in “do not disturb” mode.
   • DSIP TLS must be disabled on the Expressway-E.

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   Answer: A

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10. Question 100 · 177 in bank

    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?

    • AMobile and Remote Access does not support OAuth with refresh with this configuration,
    • BThe default port for Mobile and Remote Access is 6001. Therefore, the traversal port must be port 6001 for Mobile and Remote Access to work.
    • CThe default port for Mobile and Remote Access is 6500, which creates a conflict with the existing traversal zone port.
    • DThe default port for Mobile and Remote Access is 5091, which creates a conflict with the existing SIP trunks.

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    Answer: D

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300-820 practice, question 91. 177 questions available.