Welcome back! Here are the answers to your free Cisco CCNA, CCNP, CCENT, and CompTIA Network+ questions for Monday, January 7! Security+ and A+ certification questions will be added starting tomorrow!

Cisc CCENT And Network+ Certification Exam Question:

You're configuring a firewall and want to make sure Telnet traffic is allowed. Which port do you have to allow?

Answer: That's TCP port 23.

CCNA Certification:

What is the range of Class B RFC 1918 addresses?

Answer: 172.16.0.0 - 172.31.255.255 (172.16.0.0 /16)


CCNP Certification / BSCI Exam:

RouterA is the DR for a broadcast segment, with RouterB as the BDR. RouterA is rebooted. While RouterA is rebooting, RouterB becomes the DR and RouterC becomes the BDR. What describes RouterA's role five minutes after it comes back online?

Answer: RouterA will become a DROTHER, as it will be neither the DR nor the BDR. With OSPF, a DR/BDR election is not held when a router comes online, or when a router that was previously a DR or BDR comes back online.


CCNP Certification / BCMSN Exam:

In an Etherchannel, what mathematical operation decides the physical channel that will actually carry the data from a particular source to a particular destination?

Answer: The full name is "exclusive OR", generally expressed as XOR.


CCNP Certification / ISCW Exam:

What is the most effective defense against an MitM attack?

Answer: Cryptography is considered the most effective defense against Man-in-the-Middle attacks.


CCNP Certification / ONT Exam:

Briefly define the term "tail drop".

Answer: Tail drop occurs when packets are dropped from the tail end of a queue because the queue itself is full.


New questions posted later today - Wednesday, January 9!