|
Home::All
Cisco CCNA Certification: Broadcasts, Unicasts, And Multicasts
Author : Chris Bryant, CCIE #12933
When you begin your CCNA studies, you get hit with a lot of different networking terms right away that you might not be familiar with. What makes it a little more confusing is that a lot of these terms sound a lot alike. Here, we're going to discuss the differences between broadcasts, multicasts, and unicasts at both the Data Link (Layer 2) and Network (Layer 3) layers of the OSI model.
A broadcast is simply a unit of information that every other device on the segment will receive. A broadcast is indicated by having every bit of the address set to its highest possible value. Since a hexadecimal bit's highest value is "f", a hexadecimal broadcast is ff-ff-ff-ff-ff-ff (or FF-FF-FF-FF-FF-FF, as the upper case does not affect hex value). The CCNA exam will demand you be very familiar with hex conversions, so if you're not comfortable with these conversions, get comfortable with them before taking the exam!
At layer 3, a broadcast is indicated by setting every bit in the 32-bit binary string to "1", making the dotted decimal value 255.255.255.255. Every host on a segment will receive such a broadcast. (Keep in mind that switches will forward a broadcast, but routers do not.) In contrast to a broadcast, a unicast is a packet or frame with only one destination.
There is a middle ground between broadcasts and unicasts, and that is a multicast. Where a broadcast will be received by all, and a unicast is received by only one host, a multicast will be received by multiple hosts, all belonging to a "multicast group". As you climb the Cisco certification pyramid, you'll be introduced to creating multicast groups and controlling multicast traffic, but for your CCNA studies you need only keep certain multicast groups in mind.
Class D addresses are reserved for multicasting this range is 224.0.0.0 - 239.255.255.255. The addresses 224.0.0.0 - 224.255.255.255 are reserved for use by network protocols on a local network segment, and like broadcasts, routers will not forward these multicast packets. (Packets with these addresses are sent with a Time To Live of 1.)
As a CCNA candidate, you should know that OSPF routers use the address 224.0.0.5 to send hellos, EIGRP routers use 224.0.0.10 to send updates, and RIP version 2 uses 224.0.0.9 to send routing updates. RIP version 1 and IGRP both broadcast their updates.
Multicasting gets a bit more complicated as you go from your CCNA to the CCNP and CCIE, but by simply understanding what multicasting is, you go a long way toward securing the CCNA.
Article Source: http://www.articledashboard.com
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of free http://www.thebryantadvantage.com/">CCNA and http://www.thebryantadvantage.com/ccnpstorebsci.htm">CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. Video courses and training, binary and subnetting help, and corporate training are also available. Pass the http://www.thebryantadvantage.com/UltimateCCNAStudyPackage.html">CCNA exam and http://www.thebryantadvantage.com/ccnpstorebsci.htm">CCNP exams with Chris Bryant, CCIE #12933!
For a copy of his FREE ebooks, How To Pass The CCNA and How To Pass The CCNP, visit the website and download your copies!
Spam emails More free articles Related articles
|
More related feeds |
Cisco CCNA Certification Broadcasts, Unicasts, And Multicasts
There is a region connector between broadcasts and unicasts, and that is a multicast. Where a programme module be conventional by all, and a unicast is conventional by exclusive digit host, a multicast module be conventional by binary ...Cisco CCNA Certification: Broadcasts, Unicasts, And Multicasts
When you’re getting started on your CCNA, these terms can get pretty confusing. Learn how to keep them straight, along with other vital CCNA exam information, from Chris Bryant, CCIE #12933. cisco ccna certification broadcasts, unicasts, and multicasts
when you begin your ccna studies, you intend impact with a aggregation of assorted networking cost correct absent that you strength not be old with. what makes it a lowercase more unclear is that a aggregation of these cost good a ... CCNP Training » Blog Archive » Cisco CCNP Certification The BGP ...
Cisco CCNA Certification How And Why Switches Trunk · Cisco CCNP Certification Introduction To BGP · Cisco CCNP BCMSN Exam Tutorial Configuring CGMP On Routers & Switches · Cisco CCNA Certification Broadcasts, Unicasts, And Multicasts ... cisco ccna certification: broadcasts, unicasts, and multicasts
when you begin your ccna studies, you get hit with a lot of different networking terms right away that you might not be familiar with. what makes it a little more confusing is that a lot of these terms sound a lot alike. ... cisco ccna certification: broadcasts, unicasts, and multicasts
where a broadcast will be received by all, and a unicast is received by only one host, a multicast will be received by multiple hosts, all belonging to a “multicast group”. as you climb the cisco certification pyramid, ... Testking HP HP0-207 | Donwload Free Latest TK Certification Exams ...
C. Replace broadcast and multicast addresses with the unicast MAC addresses of its neighbors in the mesh. D. Flood broadcast and multicast traffic through meshed and non-meshed ports. Answer: A. Testking HP0-207 ... CCNP Training » Blog Archive » CCNP Certification BSCI Exam ...
Cisco CCNP BCMSN Exam Tutorial Configuring CGMP On Routers & Switches · Cisco CCNA Certification Broadcasts, Unicasts, And Multicasts · Cisco CCNP BSCI Exam Tutorial BGP Adjacency States · Cisco CCNP BSCI Exam Tutorial Configuring And ... CCNP Training » Blog Archive » Romancing San Francisco [End ...
... Cisco CCNA Certification Broadcasts, Unicasts, And Multicasts · Cisco CCNP BSCI Exam Tutorial BGP Adjacency States · Cisco CCNP BSCI Exam Tutorial Configuring And Troubleshooting OSPF Virtual Links · Cisco CCNP BSCI Certification ... Testinside cisco CCIE 350-027 | Free Latest Testking Pass4sure ...
LAN ports from being disrupted by a broadcast, multicast, or unicast traffic storm on physical interfaces. Traffic storm control (also called traffic suppression) monitors incoming traffic levels over a 1-second traffic storm control ...
|
|
|
