Cisco 300-820 Online Practice Questions and Exam Preparation

Cisco 300-820 Online Questions & Answers

• Question 61:

  An engineer must configure the zone to connect to an Expressway-E using Single NIC with NAT. The internal IP address is 192.168.10.63, and the NAT address is 203.0.113.5. What must the engineer configure on the Expressway-C to meet this requirement?

  A. traversal zone with the peer address 192.168.10.63
  B. neighbor zone with the peer address 192.168.10.63
  C. traversal zone with the peer address of 203.0.113.5
  D. neighbor zone with the peer address of 203.0.113.5
  C. traversal zone with the peer address of 203.0.113.5

  ---

  Explanation Explanation/Reference:Note - You must enter the FQDN of the Expressway-E, as it is seen from outside the network, as the peer address on the Expressway-C's secure traversal zone. The reason for this is that in static NAT mode, the Expressway-E requests that incoming signaling and media traffic should be sent to its external FQDN, rather than its private name. This also means that the external fifirewall must allow traffic from the Expressway-C to the Expressway-E's external FQDN. This is known as NAT reflection, and may not be supported by all types of fififirewalls.

• Question 62:

  Refer to the exhibit.

  

  An ISDN gateway is registered to Expressway-C with a prefix of 9 and/or it has a neighbor zone specified that routes calls starting with a 9.

  Which value should be entered into the "Source" field to prevent toll fraud regardless at origin of the call?

  A. Traversal Zone
  B. Any
  C. Neighbor Zone
  D. All
  B. Any

  ---

  The dropdown options for the Source field are: 1. Any 2. All zones 3. Local Zone 4. Named https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-8/Cisco-Expressway-Basic-Configuration-Deployment-Guide-X8-8.pdf

• Question 63:

  An engineer is configuring Cisco Expressway-E and needs to implement toll fraud prevention. Which configuration meets this requirement?

  A. Enable SIP ALG inspection on the network address translation firewall.
  B. Enable and configure local call policy.
  C. Enable and configure the Expressway-E firewall.
  D. Configure the external firewall to block specific IPs.
  B. Enable and configure local call policy.

• Question 64:

  Which step is required when configuring Cisco Webex Hybrid Message Service?

  A. Add Expressway-C and Cisco UCM to the Cisco Webex Cloud.
  B. Register Expressway-C Connector Hosts to the Cisco Webex Cloud.
  C. Add Cisco Unity Connection to Expressway-E.
  D. Register Expressway-C to Cisco UCM.
  B. Register Expressway-C Connector Hosts to the Cisco Webex Cloud.

• Question 65:

  Which option changes the addresses and ports in voice and video signaling messages?

  A. Firewall ALG
  B. NAT overload
  C. NAT Pinhole
  D. NAT ALG
  D. NAT ALG

• Question 66:

  Which two statements about Cisco Webex Video Mesh Nodes are true? (Choose two.)

  A. When Expressway Core works with VMN clusters, Expressway Core decides which VMN is used for signaling/media connection.
  B. Cloud-registered devices choose a VMN cluster based on the lowest STUN round trip delay.
  C. The cascading traffic between VMN must bypass the firewall.
  D. When Cisco Unified Communications Manager works with multiple VMNs, Cisco Unified CM decides which VMN is used for signaling connection.
  E. A VMN can terminate a media connection while operating in maintenance mode.
  B. Cloud-registered devices choose a VMN cluster based on the lowest STUN round trip delay.
  D. When Cisco Unified Communications Manager works with multiple VMNs, Cisco Unified CM decides which VMN is used for signaling connection.

• Question 67:

  An engineer is supporting an existing Cisco Collaboration deployment that has internal and external home users using the solution without VPN. Business usage also includes B2B calling for voice and video. Suddenly the engineer receives a report that one of the home office users cannot use the Cisco Jabber client, and shortly after, a few more reports come in for the same error. What must the engineer check first to resolve this issue?

  A. client logs of the users
  B. real-time monitoring toll logs for problems
  C. alarms on the Cisco Expressways
  D. alarms on the Cisco UCM Cluster
  C. alarms on the Cisco Expressways

• Question 68:

  An administrator is configuring DNS to allow Mobile and Remote Access logins for the domain cisco.com. Where must the _collab- edge_tls.cisco.com DNS SRV record be configured?

  A. in the public DNS server
  B. in DNS SRV settings under Cisco Unified OS Administration in Cisco UCM
  C. in DNS settings in the Expressway-E on the interface that faces the Internet
  D. in DNS settings under Cisco Unified OS Administration in Cisco UCM
  A. in the public DNS server

• Question 69:

  Refer to the exhibit.

  

  The firewall has been configured from NAT 192.168.108.2 to 100.64.0.1. Which configuration changes are needed for an Expressway-E with dual network interfaces?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  B. Option B

• Question 70:

  What is the result if force encryption for media is enabled in the Expressway on a zone that points to a system/endpoint that is not configured for encryption?

  A. The call is dropped.
  B. The call works with one end only sending encrypted media.
  C. The call renegotiates for unencrypted media.
  D. The call uses encryption if available, or it falls back to unencrypted media.
  A. The call is dropped.