200-301 V1 Part 1: Intro

TCP/IP Model? Check. TCP/IP Models? Yes, two of them, but it’s no big deal. Just take the extra minute to remember the details. The latest practice question asks a question that requires you to [...]

Most CCNA candidates do not get all that excited about reviewing the TCP/IP or OSI models, but it never hurts to review the concepts and terms while practicing for the exam. Today I’ll ask a [...]

What happens over an Ethernet WAN link? What Data Link addresses appear in the frame that the routers forward over the WAN? What data link headers exist on the WAN link? What types of cabling [...]

WAN connections span much longer distances than LANs – so what happens in that WAN? Even for CCENT and CCNA, you can understand some of the basic facts about how a WAN service provider builds a [...]

The term LAN broadcast may have a specific meaning to you, with the contents of the Ethernet header leaping from your memory. But maybe not. What about the source address? Type field?  Check out [...]

To answer some #CCNA questions, you need to think like a network analyzer (e.g., Wireshark). What values sit in the headers of an Ethernet frame or IP packet? In this next sample question, you’ll [...]

This latest #CCNA / #CCENT question uses a specific scenario: a working ping, a clearing of a switch MAC address table, and a repeat of the ping. The scenario hopes to make stretch a bit and [...]

#CCNA candidates learn about ARP early in the ICND1 half of their studies, and it takes just a few minutes to learn the basics. At the same time, people who write CCNA exam questions can ask us [...]

Host A web browsers to server E, which sits on a different subnet. Who ARPs for whom, and where? Check the question, pick your answer, and come back here to check your answer and see the explanation.

Are you an #ARP pretender? ARP is simple. At the same time, ARP can be used as both a testing tool and interview tool determine whether someone really knows how networks work, or if they just [...]