Interviewing for a job on Monday. Need some help with RFC applications

[Ulfwald]

Can anyone tell me about RFC applications?

Also are there any quick, down and dirty turtorials on TCP/IP out there. I currently have TCPIP in 24 Hours, TCPIP Bible, as well as a whole lot of other books regarding TCPIP relating to MS. I need to ace this interview.

 

[spidey07]

RFC - request for comments.

Considered the "basis" or "standard" for all network communications. From addressing to routing to specifying how a protocol is supposed to work and the supported commands (ex, HTTP, SMTP)

There are thousands.

big one off the top of my head is RFC1918 - private IP addressing (192.168.x.x, 10.x.x.x, 172.16.x.x, etc)

hope this helps. Otherwise reading RFCs is asking for a headache but sometimes you need to read them.

 

[Ulfwald]

Been downloading RFCs today, going over them tonight and this weekend

 

[Buddha Bart]

Originally posted by: Ulfwald
Also are there any quick, down and dirty turtorials on TCP/IP out there.

Learn TCP/IP.com

 

[AEB]

why are you trying to get a job about stuff of which you have no knowlege

 

[Ulfwald]

I know about the basic TCP/IP, but this job is very indepth. I want to be able to support my family.

 

[dmcowen674]

Originally posted by: Ulfwald
I know about the basic TCP/IP, but this job is very indepth. I want to be able to support my family.

He has the knowledge, most that can be classified as a"Geek" do. It is a twisting of job Titles, names and qualifications that makes the placement into the puzzle of employment the Nightmare that ot is.

Good Luck Ulf.

 

[AEB]

i see just for the record i was being sincere. i know certain employers like for specific knowledge just from your first post made it sound llike

 

[hatboy]

IMHO, unless you have a bad interviewer, it's more important in a job interview to show that you CAN learn things, rather than showing that you've memorized all of the details of something. If you get the job and you need to know some technical detail, you can always look it up in a book or on the net. Therefore, the ability to memorize detail isn't that impressive. What is impressive is being able to respond intelligently to a question you've never encountered before, or being able to give examples of how you adapted quickly to some situation that was foreign to you. Unfortunately, those kinds of things can't really be studied for. If I were you, I wouldn't study a huge amount before the interview, because it will probably just make you nervous and you'll be more likely to get flustered during the interview. Instead, I'd spend the time thinking of good examples of past experiences that will make you look good (these probably WILL come up during the interview).

Just my two cents.

 

[Ulfwald]

Ok, here is one for you folks.


List the IP addresses, the default gateway, and the subnet mask for the following IP configuration:

65.43.87.10/29

 

[AT]

Network IPs: 65.43.87.8-14
Broadcast: 65.43.87.15
Subnet mask: 255.255.255.248 =/29

Default gateway is can be anything in that network address space.

Here's another source for basic IP-stuff

3Com's tutorial.

 

[Ulfwald]

Ok, so how did you arrive at that?

 

[AT]

/32=255, /31=254, /30=252, /29=248

.248 mask has 8-addresses (/32= 1 address, /31=2, /30=4, /29=8), 65.43.87.10 is in the second network since first network is 65.43.87.0-65.43.87-7 so the network is 65.43.87.8 and broadcast 65.43.87.15.

And default gateway address can be anything in that network, if there is need for it (usually is). Default gateway address is up to the network admin to decide. Many choose it to be the first or last usable IP in the network.

You can also play around with this.

 

[Ulfwald]

I still don't understand How you actually determine how many IP addresses are available. I got the /29 part. You turn on all bits in the first 3 octets of the sub net mask, (255.255.255.x) then turn on the first 5 bits of the last octet (249). then the last 3 bits are the host ID. 4 2 1. So can you explain how to get the number of available HOST IDs

 

[AT]

If you know that your network part is 5-bits and host part 3-bits. Then the amount of IP-addresses is 2^3

Net | Host
00000|000 65.43.87.0/29
00000|001 65.43.87.1
00000|010 65.43.87.2
00000|011 65.43.87.3
00000|100 65.43.87.4
00000|101 65.43.87.5
00000|110 65.43.87.6
00000|111 65.43.87.7

00001|000 65.43.87.8/29
00001|001 65.43.87.9
00001|010 65.43.87.10
00001|011 65.43.87.11
00001|100 65.43.87.12
00001|101 65.43.87.13
00001|110 65.43.87.14
00001|111 65.43.87.15


These are the last 8-bits bits for /29-network 65.43.87.0 and 65.43.87.8/29. Last address is always broadcast, in broadcast the host sets the host bit part all 1's.