Here's your CCNA 200-120 practice exam for Friday, October 18!

And if you like practice exams (and who doesn't?), you'll LOVE what I have in store for you in November!

Let's get right to today's questions!

1.  Very short answer:  On a Cisco switch, what number is assigned to the default VLAN?


2.  Almost-as-short answer:  What decimal is represented by the binary string 11110000?


3.  The Cisco port security feature uses what value for authentication?


4.   You're configuring OSPF over an NBMA hub-and-spoke network.  On which interfaces should you find the command "ip ospf priority 0"?


A.  The hub interface only

B.  The spoke interfaces only

C.  The hub and spoke interfaces (no DR /BDR election is required on this interface type)

D.  This command is not appropriate for this kind of interface.

Answer and explanations right after this brief, important message!

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And now... the answers!

1.   The default VLAN on a Cisco switch is VLAN 1.

2.   The binary string 11110000 has the 128, 64, 32, and 16 bits set to 1.  Add 'em up and you have 240.

3.   Cisco port security uses the source MAC address of incoming frames for authentication (or lack of same!)

4.   "B".   You should use the ip ospf priority 0 command on the spoke interfaces to prevent them from taking part in the DR/ BDR election.

That's it for now -- a new practice exam right here on Saturday!  See you then!

Chris B.