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SSH - Secured shell runs on all Unix-like operating systems, but originally was it a part of standard Unix package?
Nope, it didn't come out until much later (1995) unix was from 1969.
http://en.wikipedia.org/wiki/Secure_Shell#Version_1.x
It was originally released as freeware:
The goal of SSH was to replace the earlier rlogin, TELNET and rsh
protocols, which did not provide strong authentication nor guarantee
confidentiality. Ylönen released his implementation as freeware in
July 1995, and the tool quickly gained in popularity.
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I need to know whether the "crypt" Command Unix/Solaris 10 support 128bit encryption/decryption.
A Blog Post shows that crypt on Solaris 10 does not use anything like DES, RSA, AES etc (wich are typically involved when speaking of "128 Bit encryption"). It uses a weak function that can be broken by many tools, one mentioned in that very article. Use the openssl library or tools when you need up-to-date cryptography.
Use the encrypt and decrypt commands which are always installed on Solaris 10. Openssl provides similar functionalities but might be missing from a standard installation.
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Is WebDAV a commonly-used, standard protocol?
Yes, it is a standard protocol and it is widely used. Windows, Mac OS X and Linux do support it, SubVersion uses it as one of its primary protocols, and there are countless other examples.
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What's the best network simulator for educational purpose?
I want to use it to help students learn the basic network concepts, such as LAN, WAN, IP addressing, network layers etc.
If you are looking for Network event simulator,
ns-2 is the one. You can have a look at the example programs in ns-2 directory to illustrate basic ideas.
For demonstration of Wireless LAN,Wifi, WiMax and other networks simulation, you can make use of contributed page by other researchers and educational institutions.
ns-3 is the successor to ns-2. It supports newer technologies such as IPv6, WiMAX, and LTE, and is under active development. It is also in use as courseware
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I need to add DKIM to a Postfix installation. I've found two implementations that work with Postfix. OpenDKIM, and dkim-milter dkim-milter. The former claims to be a fork of the latter.
OpenDKIM appears to be the more active project, judging from releases and mailing list activity.
Which of these implementations (or another) should I use?
At least one other user found that OpenDKIM worked better. So I would probably try that first.
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I am 18 years old. I wish to become a network engineer. I don't know where I should start and what to study. I am interested in learning through the internet.
Can any one please suggest any URLs and topics/subject to be covered by a person new to networking.
is it right for a fresher to start with CCNA certification directly
Thanks!
What do you know about networks as is? What have you read on Wikipedia on the subject?
Why does this seem like a fake question?
http://en.wikipedia.org/wiki/Computer_network
http://en.wikipedia.org/wiki/Local_area_network
http://en.wikipedia.org/wiki/OSI_model
http://en.wikipedia.org/wiki/Internet_protocol_suite
Those are all fundamentals to networking. I would say make sure you understand those topics, and follow any WP links you don't know. You can use tools like VirtualBox to create a local virtual machine network to play with.