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#51
Certifications and Careers / Re: Certification Goals for 20...
Last post by Otanx - December 15, 2023, 10:48:18 AMDepending on how many credits you need there are 28 free ones on u.cisco.com. The DEVNAE and SDWFND trainings are free. Just have to take the time to do it.
-Otanx
-Otanx
#52
Certifications and Careers / Re: Certification Goals for 20...
Last post by config t - December 15, 2023, 12:11:38 AMQuote from: Otanx on December 04, 2023, 09:21:50 AMFor the first time in awhile I actually got most of my goals this year. Renewed both CISSP, and CCNP. The CCNP was close I didn't end up with enough credits from Cisco Live, and had to do some online training through U.Cisco to get the last few. The CPEs didn't actually get processed until after the CCNP expired, but they date them to when you took it, and it reactivated. I was a little worried for awhile. I also passed the CCNA-DevNet test. It wasn't too hard.
Now to figure out 2024 goals.
-Otanx
Close call. I had a buddy who lost 2x CCNP by neglecting to renew in time. Guy got it all back though, amazingly. My CCNP is up for renewal next May and I am debating on if I want to keep it at this point. A large part of me says yes even knowing it will be expensive.
#53
Certifications and Careers / Re: Certification Goals for 20...
Last post by deanwebb - December 14, 2023, 08:54:34 AMTalking to a developer has REALLY helped me to understand what and why all the AWS services are behind the networking stuff. That was a huge help.
#54
Certifications and Careers / Re: Certification Goals for 20...
Last post by deanwebb - December 08, 2023, 11:55:02 AMGetting AWS certs before year-end if I can. Working on CCP now and there are SO MANY AWS products offered, most of the practice test I'm working on is just matching up the right product to the right function and knowing what each of the other three answers involve... there are so many AWS database products alone, it's insane.
#55
Certifications and Careers / Re: Certification Goals for 20...
Last post by Otanx - December 04, 2023, 09:21:50 AMFor the first time in awhile I actually got most of my goals this year. Renewed both CISSP, and CCNP. The CCNP was close I didn't end up with enough credits from Cisco Live, and had to do some online training through U.Cisco to get the last few. The CPEs didn't actually get processed until after the CCNP expired, but they date them to when you took it, and it reactivated. I was a little worried for awhile. I also passed the CCNA-DevNet test. It wasn't too hard.
Now to figure out 2024 goals.
-Otanx
Now to figure out 2024 goals.
-Otanx
#56
Homework Help / Re: Why was TCP 3 way handshak...
Last post by deanwebb - December 02, 2023, 09:05:19 PMThe answer is in the nature of TCP where it wants to guarantee transmission. The three way handshake means that the recipient can get a message from the sender, the sender can get acknowledgement from the recipient, and the recipient can get final acknowledgement from the sender - it means the connection is stable enough for bidirectional transmission.
Compared to UDP, which is connectionless, TCP has much greater overhead. This is why voice and video protocols rely on UDP and some modern applications for HTML such as Google's QUIC also go with UDP. It will send faster and if parts are missing, then error correction on the client end can patch things over. But for secure data transmission where completeness is required and integrity must be assured, then heavier TCP-based protocols are needed.
Consider these jokes:
I have a UDP joke, and I don't care if anyone gets it.
***
Hello, would you like to hear a TCP joke?
Yes, I'd like to hear a TCP joke.
OK, I'll tell you a TCP joke.
Okay, I will hear a TCP joke.
Are you ready to hear a TCP joke?
Yes, I am ready to hear a TCP joke.
Okay, I am about to send the TCP joke. It will last 50 seconds, has 634 characters, does not have an explicit setting, and ends with a punchline.
Okay, I am ready to get the TCP joke that will last 50 seconds, has 634 characters, does not have an explicit setting, and ends with a punchline.
I'm sorry, your connection timed out ... Hello, would you like to hear a TCP joke?
Compared to UDP, which is connectionless, TCP has much greater overhead. This is why voice and video protocols rely on UDP and some modern applications for HTML such as Google's QUIC also go with UDP. It will send faster and if parts are missing, then error correction on the client end can patch things over. But for secure data transmission where completeness is required and integrity must be assured, then heavier TCP-based protocols are needed.
Consider these jokes:
I have a UDP joke, and I don't care if anyone gets it.
***
Hello, would you like to hear a TCP joke?
Yes, I'd like to hear a TCP joke.
OK, I'll tell you a TCP joke.
Okay, I will hear a TCP joke.
Are you ready to hear a TCP joke?
Yes, I am ready to hear a TCP joke.
Okay, I am about to send the TCP joke. It will last 50 seconds, has 634 characters, does not have an explicit setting, and ends with a punchline.
Okay, I am ready to get the TCP joke that will last 50 seconds, has 634 characters, does not have an explicit setting, and ends with a punchline.
I'm sorry, your connection timed out ... Hello, would you like to hear a TCP joke?
#57
Homework Help / Why was TCP 3 way handshake de...
Last post by networkloser - December 02, 2023, 08:20:56 AMhttps://serverfault.com/questions/368567/why-is-it-3-way-handshake-and-not-more
https://serverfault.com/questions/369056/tcp-whats-the-purpose-of-the-third-step-of-3-way-handshake
https://networkengineering.stackexchange.com/questions/24068/why-do-we-need-a-3-way-handshake-why-not-just-2-way
https://gateoverflow.in/123902/three-handshake-handshake-problem-which-solved-handshake
I read all over the place but still can't find concrete answer on what problem does tcp 3 way handshake solves.
It must be designed in a clever approach.
PS how do I use this technique while building software architecture?
https://serverfault.com/questions/369056/tcp-whats-the-purpose-of-the-third-step-of-3-way-handshake
https://networkengineering.stackexchange.com/questions/24068/why-do-we-need-a-3-way-handshake-why-not-just-2-way
https://gateoverflow.in/123902/three-handshake-handshake-problem-which-solved-handshake
I read all over the place but still can't find concrete answer on what problem does tcp 3 way handshake solves.
It must be designed in a clever approach.
PS how do I use this technique while building software architecture?
#58
Homework Help / Re: Calculate the acknowledgem...
Last post by deanwebb - December 01, 2023, 09:24:38 AMInteresting bit of maths, but not really something I do in a day's work. Most of the time, if I'm reading a packet sequence, it's in Wireshark or some other capture reader, and the numbers I need are already there and I can line up communications that way. If I'm reading an asynchronous communication or one where network errors are causing retransmissions, the absence of properly-numbered packets helps to show those problems.
#59
Certifications and Careers / Re: Certification Goals for 20...
Last post by deanwebb - December 01, 2023, 08:54:01 AMOH SNAP IT'S DECEMBER
#60
Homework Help / Calculate the acknowledgement ...
Last post by networkloser - December 01, 2023, 07:42:14 AMOk a brain teaser. I assure this is not a homework. I'm learning computer networks from scratch again as I love networking.
IP Layer:
Header Length=10
Total length=1000
TCP Layer:
Sequence Number=100
Header Length=5
Find the acknowledgement number.
I know the answer and I understand it a little bit, but I want to hear your perspectives on how you'd solve it.
Here's how the youtuber solved it:
Total size at IP layer=IP_header+TCP_header+TCP_data
or 1000 =10*4+5*4+TCP_data
=> TCP_data length=940
Sequence number of first byte=100 Thus sequence number of last byte=940+100-1=1039
So the next acknowledgement number is 1040.
How'd you solve it?
IP Layer:
Header Length=10
Total length=1000
TCP Layer:
Sequence Number=100
Header Length=5
Find the acknowledgement number.
I know the answer and I understand it a little bit, but I want to hear your perspectives on how you'd solve it.
Here's how the youtuber solved it:
Total size at IP layer=IP_header+TCP_header+TCP_data
or 1000 =10*4+5*4+TCP_data
=> TCP_data length=940
Sequence number of first byte=100 Thus sequence number of last byte=940+100-1=1039
So the next acknowledgement number is 1040.
How'd you solve it?