A

The IP phone contains key information about the IP addresses of the Cisco CallManager, network gateway, TFTP server, and DNS servers. Obtaining this information allows a hacker to map out the location of key network resources.

A

Only Cisco's flagship phones, the 7940, 7960, and 7970, support configuration file authentication. The 7920 wireless handset does not support this feature.

B

You can find all the security settings for an IP phone under the Phone Configuration window in the Cisco CallManager administration utility.

A

To access the built-in web server of an IP phone, simply access the URL http://IP-Phone's-IP-address. There are no security options; you will be directed to a page giving all the information about the IP phone's network settings.

B

Gratuitous ARP attackers always operate from the local network. This is necessary due to the nature of ARP packets.

C

Even with authentication and encryption features enabled, SCCP maintains its signaling role. There are no currently known attacks against Skinny signaling, so there was no reason to secure it further.

D

An IP phone can provide all the preceding information with the exception of the intranet server address.

D

Cisco CallManager does not allow you to disable the PC port of the 7912 IP Phone. Filling the PC port of the phone with glue (or some similarly drastic step), or downgrading to the 7905 IP Phone is the best step for now.

B

Secure Sockets Layer (SSL) was the predecessor to Transport Layer Security (TLS). SSL was primarily applied to HTTPS connections, whereas TLS became more universally used.

A

Since Cisco CallManager 3.3(3), the signed firmware validation feature is already enabled. This prevents hackers from constructing their own, rogue firmware images for the Cisco IP Phones.