CCNA, CCENT, Network+, And Security+ Practice Questions: TCP, UDP, Smurf Attacks, And More!

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

C. DNS

D. ARP

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!

by: Chris Bryant, CCIE #12933