Cisco 300-820 Practice Test - Questions Answers
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Which complication does a NAT introduce in SDP for a SIP call?
Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU.
When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones.
The IP address specified in the connection data field may be an unrouteable internal address.
The encryption keys advertised in the SDP are only valid for clients not behind a NAT.
A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity.
What must be set up to enable this requirement?
Cisco Unified Border Element and Cisco ASA Firewall
Cisco Unified Border Element and Cisco Firepower Firewall
Cisco Expressway-C and Cisco Expressway-E
Cisco Expressway-C and Cisco Unified Border Element
When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?
SDP b-line
SIP record route
SDP c-line
SDP m-line
A company is installing Cisco Collaboration infrastructure and one of the requirements is that they must be able to communicate with many external parties that are using H.323 and SIP. Internally they want to register the endpoints only on SIP.
Which functionality would describe the feature that needs to be enabled and where to achieve this?
Interworking in Expressway-C
Transcoding in Cisco Unified Communications Manager
Transcoding in Expressway-C
Interworking in Cisco Unified Communications Manager
What is a key configuration requirement for Hybrid Message Service High Availability deployment with multiple IM and Presence clusters?
You must have the Intercluster Sync Agent working across your IM and Presence clusters.
You must have the Intercluster Lookup Service working across all of your IM and Presence clusters.
Your IM and Presence Service clusters must have Multiple Device Messaging disabled.
AXL service should be activated only on the publisher of each IM and Presence cluster.
Cisco Collaboration endpoints are exchanging encrypted signaling messages.
What is one major complication in implementing NAT ALG for voice and video devices?
Internal endpoints cannot use addresses from the private address space.
The NAT ALG cannot inspect the contents of encrypted signaling messages.
NAT ALG introduces jitter in the voice path.
Source addresses cannot provide the destination addresses that remote endpoints should use for return packets.
What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E? (Choose two.)
The MRA license is missing on the Expressway-E.
The Unified Communications zone is down.
Transform is not configured on Expressway-E.
The SRV record for _cisco-uds is misconfigured.
The firewall is blocking the port.
Which media encryption mode can be configured on an Expressway zone?
Advanced Encryption Standard
IPsec
Triple Data Encryption Standard
force unencrypted
What is the purpose of a transform in the Expressway server?
A transform has the function as a neighbor zone in the Expressway. It creates a connection with another server.
A transform changes the audio codec when the call goes through the Expressway.
A transform is used to route calls to a destination.
A transform changes an alias that matches certain criteria into another alias.
An organization with a domain name of example.com.
Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)
_sips._tcp.example.com
_sips._udp.example.com
_h323ls._udp.example com
_h323ls._tcp.example.com
_collab-edge._tls.example.com
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