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#1 Sir Alex Ferguson

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Posted 29 April 2010 - 03:48 PM

Hello everyone. I'm studying for the Net+ exam and have some questions. Any help is appreciated and thanks in advance.

1. CSMA/CD Ė CSMA/CA are Ethernet networks, but what determines which you use, ie software, the hardware you employ?

2. Do people still use token ring networks?

3. Im reading about communication bandwidth technologies. POTS apparently is just the old school dial up service. ISDN, DSL, Cable modems, wireless, T1 T3 etc Where im somewhat confused is X.25, Frame Relay and ATM. Iíve never heard of anyone using those three. How do you set those connections up (local or regional ISPís?) I mean you hear of people with a DSL connection or someone who has a T1 line. Iíve never heard of anyone with a frame relay or ATM line or connection.

4. What determines the usage of Cat _ cables? I know the speeds for each type of cable, but what determines what you will use. Why Cat 5 over Cat 3. Why Cat 7 over Cat 5? Do you base it on the type of data you will be sending over the LAN and the connection speeds you have to the internet?

5. Does anyone actually use coaxial cabling anymore?

6. Does anyone use NetBIOS names?

7. CSU/DSU is only used for T1 and 3 lines?

8. The demark point is where you connect to your ISP. Now it says a demarc terminating device is needed between the ISP to your network and is the starting point for the network wiring. So it gives an example of a T1 connection, going to a CSU/DSU which is connected to a terminating router . Are all routers, terminating routers or is this a specific type of router? Next it shows an example with the demarc connected to the main cross connect and at the main cross connect is a main distribution frame which is the network rack that contains the devices used to manage the connection between external communication cables and the cables of the internal network. Now is the main cross connect a term that encompasses the CSU/DSU or is it something else all together. Same with main distribution frame, is that essentially a name for the router in the above example?

9. Im fuzzy on punchdown blocks and patch panels. A patch panel is used to change the signal path and not terminate a signal correct? A punchdown block is used to terminate a signal?

10. VLANís and trunking. Im still not getting the usage of VLANs. Say you have 4 segments, each configured as an individual VLAN. Segments 1 and 2 are connected to a switch, segments 3 and 4 are connected to a switch, the switches are connected to each other with the first switch connected to the router. What exactly is the point of the VLAN? Shouldnt the switch be able to determine where to route the data (either to a segment attached to it, or forward to the other switch, or to the router?) Where did the VLAN make anything easier?

11. How prevalent are IPS and IDS and how are they any more effective than a firewall? Why would you want an IDS over an IPS since the IPS can act on the suspicious activity whereas the IDS cannot?

12. DHCP. Can a single user use DHCP or does the ISP give a static IP address when you sign up? Is DHCP something you have to install or is it on the OS?

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#2 Sir Alex Ferguson

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Posted 29 April 2010 - 04:19 PM

13. Is Kerberos only used on networks? In what situations would you use it?

14. CHAP is it only used for remote users?

15. In what situations would you use EAP?

16. I understand the theory behind cyphers, keys (public and private) etc but am fuzzy on PKI's and certificates. What is exactly managing the generation, storage and termination of keys and certificates? (Server software?)

17. RADIUS allows remote access to network servers and requires a physical server dedicated to it or just software on an existing server?

18. Diameter is essentially a newer version of Radius?

19. LDAP confuses me. It essentially allows you to store information about users, network resources, file systems and apps? How is it used by network admins? It is software?

20. TACACS+ is essentially a Cisco version of Radius?

21. 802.1x im not sure of its role since it works in conjunction with RADIUS and TACACS+

22. PPTP - only used in VPN's? Inferior to L2TP?

23. L2TP - only used in VPN's? Essentially a combination of IPsec and RADIUS (or TACACS+)?

#3 CaveDweller2

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Posted 29 April 2010 - 07:02 PM

ROFL - www.google.com = your friend. Most all of those questions can be found out there. Just search for it. You'll learn soo much more looking than if someone here answers them for you. Wikipedia is going to be your friend.

Good luck =)

Hope this helps thumbup.gif

Associate in Applied Science - Network Systems Management - Trident Technical College


#4 Sir Alex Ferguson

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Posted 29 April 2010 - 08:40 PM

ROFL - www.google.com = your friend. Most all of those questions can be found out there. Just search for it. You'll learn soo much more looking than if someone here answers them for you. Wikipedia is going to be your friend.

Good luck =)


Thanks for the help, it had not occurred to me to use google...

:thumbsup:

I have the text book in front of me, but it does not always lay things out simply...

Anyone that can help I appreciate it.

#5 CaveDweller2

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Posted 29 April 2010 - 10:30 PM

ROFL - http://www.computerforums.org/showthread.php?p=1030948

I am all for getting neck deep in discussions about networking but you are asking questions about networking terms that are explained in depth on many web sites and you will learn more searching for those answers than you will just being told what they are.

Hope this helps thumbup.gif

Associate in Applied Science - Network Systems Management - Trident Technical College


#6 Sir Alex Ferguson

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Posted 30 April 2010 - 11:13 AM

ROFL - http://www.computerforums.org/showthread.php?p=1030948

I am all for getting neck deep in discussions about networking but you are asking questions about networking terms that are explained in depth on many web sites and you will learn more searching for those answers than you will just being told what they are.


I'm not sure what is so humorous about someone looking for help.

I am googling these things, have textbooks on this and spend hours reading about it, but there is no guarantee that my understanding of it is correct. Thats why I'm looking for someone that might have the time to answer some of these questions.

#7 Sir Alex Ferguson

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Posted 30 April 2010 - 11:48 AM

Alright, I'll go back through one by one and restate what Im confused on. Hopefully Cavedweller will see im not just asking for a definition but more general theoretical applications of these protocols and devices etc.

1. CSMA/CA-CD - i understand the collision avoidance and collision detection. what im wondering is where do you determine which you will use? is the CSMA something you configure on a router or is it something you configure with software on the network?

2. token rings are they still used widely?

3.
A- x.25 and frame relay- are protocols not a connection type? my confusion is it is listed under WAN bandwidth technologies as packet-switching communication designed for long distance data transmission, with a maximum throughput of 56kbps (x.25) and 1.544mbps (Frame relay) my question being, so these are protocols, not actually a type of connection? you use x.25 or frame relay with existing connections as the protocol for delivering the data? so for example, you could have a T1 line that uses frame relay?

B. ATM - again is it a protocol or a type of connection or both? It says you can use ATM on LAN'a and WAN's, using fixed length packets to transmit data.

Which leads to a broader question. Is sat POTS, ISDN, DSL T1, Frame Relay etc just a type of protocol used over a connection that varies in its throughput speeds? Perhaps I have been looking at this all wrong. I've been looking at it as a DSL or T1 connection being a type of physical connection, when i guess it could just be differing protocols/devices used to achieve a certain throughput capability?

4. I've memorized the varying speeds for Cat cables. All im asking here is what does an admin use to determine the type of cable to use. How can you anticipate how much traffic a network will use? Do you use your internet connection speeds as the guideline or the amount fo data you expect your network to swap between it... or both?

will post more as I get time throughout the day.

Edited by Sir Alex Ferguson, 30 April 2010 - 11:49 AM.


#8 AMD010

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Posted 03 May 2010 - 01:44 AM

Alright, I'll go back through one by one and restate what Im confused on. Hopefully Cavedweller will see im not just asking for a definition but more general theoretical applications of these protocols and devices etc.

1. CSMA/CA-CD - i understand the collision avoidance and collision detection. what im wondering is where do you determine which you will use? is the CSMA something you configure on a router or is it something you configure with software on the network? CSMA/CD does not work in wireless networks. CSMA/CA works in wireless networks. they are a layer 2 protocol. that is about all you need to know for the cert.

2. token rings are they still used widely? no, Thank God

3.
A- x.25 and frame relay- are protocols not a connection type? my confusion is it is listed under WAN bandwidth technologies as packet-switching communication designed for long distance data transmission, with a maximum throughput of 56kbps (x.25) and 1.544mbps (Frame relay) my question being, so these are protocols, not actually a type of connection? you use x.25 or frame relay with existing connections as the protocol for delivering the data? so for example, you could have a T1 line that uses frame relay? for the cert you just need to know, the specs and information about each technolgy, its not going to ask you to build a network with this stuff.

B. ATM - again is it a protocol or a type of connection or both? It says you can use ATM on LAN'a and WAN's, using fixed length packets to transmit data. I dont know, its old crap.

Which leads to a broader question. Is sat POTS, ISDN, DSL T1, Frame Relay etc just a type of protocol used over a connection that varies in its throughput speeds? Perhaps I have been looking at this all wrong. I've been looking at it as a DSL or T1 connection being a type of physical connection, when i guess it could just be differing protocols/devices used to achieve a certain throughput capability? POTS is just your plain old telephone system, ISDN DSL are both run through your regular phone line, T1 is fiber or it can also be copper.

4. I've memorized the varying speeds for Cat cables. All im asking here is what does an admin use to determine the type of cable to use. How can you anticipate how much traffic a network will use? Do you use your internet connection speeds as the guideline or the amount fo data you expect your network to swap between it... or both? This is far beyond the scope of the Net+ certification and could vary depending on a thousand different variables. Trust me, you are not going to get your Net+ cert get hired for a job and then be expected to build an entire network from scratch, actually you will be running cables through floors, walls and ceilings before they will let you touch anything. Either way.... really depends on how big the corporation is, I can say at my school and at work, we have Gigabit connections to our machines, which means they probably have 10Gig switches coming off of a fiber backbone. really IDK but thats just my guess.

will post more as I get time throughout the day.


Win XP Pro, Windows 7, Ubuntu. AMD Athlon X2 5600+ 4x1GB DDR2800, 500 GB SATA, Geforce 8500GT.

MCTS, A+, Net+.

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