CCNA, CCENT, Network+, Security+ TCP, UDP, Smurf Attacks

By: Chris Bryant

Let’s test your knowledge of UDP, TCP, smurf attacks, EIGRP, and more with these questions designed to help you prepare for success on your CCENT, CCNA, CCNP, Network+, and Security+ certification exams!

CCENT Certification / Network+ Certification:

Which of the following protocols runs on both UDP and TCP?

A. DHCP

B. SNMP

E. Inverse ARP

Answer: C. DNS runs on port 53, both on TCP and UDP.

Security+ Certification:

Briefly define the term "smurf attack". (Not too briefly, though!)

Answer: Basically, a smurf attack involves sends ICMP Echo packets (pings) with the intended victim's IP address specified as the source of the Echo packets. This transmission takes the form of a directed broadcast, which means that quite a few hosts can receive it - and then respond with ICMP Echo Replies, which will all be sent to the intended victim.

CCNA Exam:

R1 and R3 are directly connected at their respective Serial1 interfaces via a DTE/DCE cable.

What command will tell you whether the interface is connected to the DTE or DCE end of the cable?

Answer: Run show controller serial 1 on either router - the DTE / DCE information is near the top of the output.

CCNP Certification / BSCI Exam:

DUAL has discovered four possible paths to a remote network, with the following metrics: PathA, 1500. PathB, 1500. PathC, 2600. PathD, 3100. What command will allow EIGRP to use the first three paths without using the fourth?

Answer: variance 2 would do the job. Any path with a metric of 3000 or lower will be utilized; setting it to 3 would bring PathD into the equation.

CCNP Certification / BCMSN Exam:

What is the main purpose of IEEE 802.3ac?

Answer: The IEEE 802.3ac standard allows the maximum frame length to be extended to 1522 bytes, which means the dot1q 4-byte header doesn't cause problems in transmission.

CCNP Certification / ONT Exam:

Which queueing strategy gives priority to interactive, low-bandwidth communications by default?

Answer: Weighted Fair Queueing (WFQ) gives priority to interactive, low-bandwidth conversations, and then splits the remaining bandwidth fairly among the remaining conversations.

Look for a new set of Cisco and CompTIA certification exam questions soon!

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