July 2009
Intermediate to advanced
752 pages
23h 19m
English
Content preview from JUNOS Enterprise SwitchingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter Review Answers
Answer: A. 802.3 LANs use both a length code to provide padding at the MAC layer, and LLC to identify the upper layer.
Answer: C. IP, a Network layer protocol, is the first with end-to-end scope. Although it is end to end, IP is acted upon at each routed hop. TCP, a Transport layer protocol, goes end to end and is generally processed only by the endpoints.
Answer: False. Unlike a repeater, a bridge terminates the CD.
Answer: A. ARP is used in all LANs and some WANs, as well. It’s needed because of the independence between Layer 2 and Layer 3.
Answer: B. The address provided is a network address, so only one network can be addressed as 200.0.0.0/30. On that network you can have a host 1 and a host 2, given there are two host bits to work with. The combinations of all 0s and all 1s are generally not permitted. You could use VLSM to further subnet—say, to a /32, which would yield two networks with the same number of hosts, assuming there is support for /31 addressing on that device.
Answer: B. The 128 in the high-order octet indicates that this is a Class B address. Such an address has a default network mask of /16 or 255.255.0.0. This is a subnetted Class B that is using a Class C mask. As the whole notion of classes is gone, it’s best to just say this is a prefix with a 24-bit mask.
Answer: E. Coax cable was rarely used P-to-P, and was a true multipoint bus. UTP and fiber mandate P-to-P-type links, on the other hand.
Answer: B. ARP is always used for IP over LANs. ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.