Question 1

Refer to the exhibit. After hardening the Cisco Expressway, an engineer noticed this error in the logs HTTP error 429 "Too Many Requests,” and users report that authentication is not possible on more than two devices. What must the engineer increase to correct the issue?

Options :

A : maximum authorizations per period

B : credentials refresh interval

C : rate control period

D : credentials cleanup interval

Answer: A

Question 2

An Expressway Server has both network protocols (IPv4 and IPv6) enabled. Which two behaviors are correct? (Choose two.)

Options :

A :

If the calling endpoint is on an IPv4-Only network and the called endpoint is on an IPV6-Only network, a NAT64 device must convert the IPv4 addresses to IPv6 addresses.

B :

Endpoints register with either IPv4 or IPv6 addresses, but dual-stack endpoints choose IPv6 protocol by default.

C :

If the calling endpoint is on an IPv4-Only network and the called endpoint is on an IPv6-Only network, the Expressway Server act as a gateway and convert the two protocol versions.

D :

Endpoints register only with IPv6 addresses on an Expressway Server with IPv6 protocol enabled regardless of the state of IPv4 protocol.

E :

Endpoints register with either IPv4 or IPv6 addresses, and endpoints decide which protocol to use by the format of the configured Expressway Server IP address.

Answer: C,E

Question 3

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?

Options :

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.

Answer: A

Question 4

An engineer is configuring the Expressway cluster to allow Jabber clients that are outside the enterprise network to register, make calls, and send instant messages using the internal Cisco UCM. Which action must be taken before a secure UC traversal zone is added to the Expressway-C?

Options :

A : Add Instant Message and Presence service clusters.

B : Add a Cisco UCM cluster.

C : Configure SIP OAuth mode.

D : Establish certificate trust between the Expressway-C and Expressway-E.

Answer: D

Question 5

Refer to the exhibit. An engineer is deploying mobile and remote access in an environment that already had functioning Business to Business calling. Mobile and remote access SIP registrations are failing. To troubleshoot, SIP logs were collected. How is this issue resolved?

Options :

A :

Change the SIP profile on the SIP trunk for the Expressway-E to Standard SIP Profile for TelePresence Endpoint

B :

Change the “Incoming Port” in the SIP Trunk Security Profile for the Expressway-C to not match SIP line registrations

C :

Enable autoregistration for the appropriate DN range on the Cisco UCM servers running the CallManager service

D :

Write a custom normalization script since the “vcs-interop” normalization script does not allow registrations

Answer: B

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