Question 1

What is a description of an Interactive Connectivity Establishment?

Options :

A : It is used by B2BUA to keep the firewall ports opened for inbound/outbound calls.

B : It allows Mobile and Remote Access endpoints to connect video calls signaling peer-to-peer.

C : It allows calling external endpoints with reduced overhead under VPN connections

D : It is used to find the best media path between network elements in traversal calls.

Answer: B

Question 2

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

Options :

A : Expressway-C “DNS”, Expressway-E “Traversal server”

B : Expressway-C “Traversal server”, Expressway-E “Traversal client”

C : Expressway-C “Neighbor”, Expressway-E “Neighbor”

D : Expressway-C “Traversal client”, Expressway-E “Traversal server”

Answer: D

Question 3

Which attribute in the SDP for a call is affected by the static NAT address configuration in an ExpresswayE?

Options :

A : connection

B : name

C : version

D : bandwidth

Answer: B

Question 4

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

Options :

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.

Answer: B,D

Question 5

300-820-page39-image6

Refer to the exhibit. An Expressway-C and Expressway-E are configured for B2B calling and the

Expressway-E zone is set to TLS Verify Currently, calls do not reach the Expressway-C. The Traversal

Client zone on the Expressway-C for B2B reports the information in the exhibit for the Peer 1 address.

Which action resolves this error?

Options :

A :

Configure the Expressway-C Traversal Client zone Peer 1 address with the fully qualified domain name

of the Expressway-E.

B : Configure the Expressway-C Traversal Client zone transport protocol with TCP.

C : Add a server certificate to the Expressway-C that is signed by a certificate authority.

D : Add an intermediate certificate to the Expressway-C that is signed by a certificate authority.

Answer: D

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