Let's test your knowledge of MAC addresses, network attacks, VLAN trunking protocol, and more with these CCNA, CCENT, Network +, and Security + practice exam questions!
CCNA / CCENT / Network + Exam:
A switch receives a frame with a unicast destination MAC, but the switch does not have an entry for that MAC in its bridging table. What term describes the default action of the switch?
Answer: A. The frame will be "flooded" – that is, sent out every port except the one it came in on.
Security + Certification Exam:
A potential network intruder calls a helpdesk and pretends to be an employee of the company in an attempt to get that employee's password. What kind of network attack is this?
Answer: This is a social engineering attack.
CCNP Certification / BSCI Exam:
Fill in the blank: ISIS assigns redistributed routes a metric of ____________.
Answer: ISIS assigns redistributed routes a metric of 0.
CCNP Certification / BCMSN Exam:
A VTP switch has a revision number of 5. This switch receives a VTP advertisement with a revision number of 6. What action (s) will this switch take?
A. The switch will accept the advertisement.
B. The switch will reject the advertisement.
C. The switch will increment its revision number.
D. The switch will decrement its revision number.
Answers: A, C. The VTP switch will accept the advertisement; since the revision number of the ad is higher than its own, the advertisement is more recent. The switch will then increment its revision number by one.
CCNP Certification / ISCW Exam:
Which of the following queueing methods poses the greatest threat of TCP Global Synchronization?
Answer: A. CBWFQ uses Tail Drop as its default method of packet drop. In turn, Tail Drop can lead to TCP Global Synchronization.
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