Saturday, July 14, 2007

Here are the answers to Friday's Cisco questions!

CCNA Certification:

The default priority of an interface connected to an OSPF segment is ____________.

Answer: 1. Don't get priority confused with cost - the cost of an OSPF-enabled interface will vary according to that port's speed, but the default priority does not depend on speed.

CCNP Certification / BSCI Exam:

What does an IPv6 address beginning with 2002 and carrying a /48 prefix indicate?

Answer: 6to4 tunnel edge routers (the IPv6 routers that are communicating with each other through the IPv4 cloud) carry an IPv6 address beginning with 2002, followed by their IPv4 address expressed in hex, and carry a /48 prefix.

CCNP Certification / BCMSN Exam:

What VTP advertisement is sent by the VTP server only upon a change in the VLAN database?

Answer: Subset advertisements are sent by the VTP server only when there's a change in the VLAN database. This ad will contain the new name of the VLAN, the new MTU (if it's been changed), the VLAN type, and whether the VLAN was created, deleted, activated, or suspended.

CCNP Certification / ISCW Exam:

What's the basic difference between a symmetric key and an asymmetric key?

(The answer "one letter" is not acceptable. Nice try, though!)

Answer: Symmetric keys such as DES, 3DES, and AES use a single value to encrypt and unencrypt data. Asymmetric keys such as RSA and Diffie-Hellman use separate values for encryption and decryption.

CCNP Certification / ONT Exam:

What does RSVP do? RSVP is used by which QoS model(s)?

Answer: The Resource Reservation Protocol (RSVP) assign a source-to-destination level of service that is guaranteed by each router along that path. Basically, bandwidth is reserved for the data in advance of the data actually using the bandwidth! RSVP is part of the Integrated Services (IntServ) model.

Fresh-baked questions posted later today!

To your success,

Chris Bryant
CCIE #12933

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