From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001 From: Sven Eisenhauer Date: Fri, 10 Nov 2023 15:11:48 +0100 Subject: add new repo --- Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/buttons.html | 108 +++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/content.html | 178 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/index.html | 29 ++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/media.html | 21 +++ 4 files changed, 336 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/buttons.html new file mode 100644 index 0000000..ba449a6 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_1_3/buttons.html @@ -0,0 +1,108 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 1.1 + Scaling Networks with NAT and + PAT 
  + 1.1.3 + Major NAT and PAT features 
+ + + + + + +
+ + + NAT translations can be used for a variety of purposes and can be + either dynamically or statically assigned. Static NAT is designed to + allow one-to-one mapping of local and global addresses. This is + particularly useful for hosts which must have a consistent address + that is accessible from the Internet. Such hosts may be enterprise + servers or networking devices.

Dynamic NAT is designed to map a + private IP address to a public address. Any IP address from a pool of + public IP addresses is assigned to a network host. Overloading, or + Port Address Translation (PAT), maps multiple private IP addresses to + a single public IP address. Multiple addresses can be mapped to a + single address because each private address is tracked by a port + number. + +

PAT uses + unique source port numbers on the inside global IP address to + distinguish between translations. + + The port + number is encoded in 16 bits. The total number of internal addresses + that can be translated to one external address could theoretically be + as high as 65,536 per IP address. Realistically, the number of ports + that can be assigned a single IP address is around 4000. PAT will attempt to + preserve the original source port. If this source port is already + used, PAT will assign the first available port number starting from + the beginning of the appropriate port group 0-511, 512-1023, or + 1024-65535. When there are no more ports available and there is more + than one external IP address configured, PAT moves to the next IP + address to try to allocate the original source port again. This + process continues until it runs out of available ports and external IP + addresses.

NAT offers the following benefits:

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  • Eliminates reassigning each host a new IP address when + changing to a new ISP. NAT eliminates the need to readdress all + hosts that require external access, saving time and money.
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  • Conserves addresses through application port-level + multiplexing. With PAT, internal hosts can share a single public + IP address for all external communications. In this + type of configuration, very few external addresses are required to + support many internal hosts, thereby conserving IP addresses.
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  • Protects network security. Because private networks do not + advertise their addresses or internal topology, they remain + reasonably secure when used in conjunction with NAT to gain + controlled external access.
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+ + + Interactive Media Activity

+ +

Drag and Drop: Network Address Translation with Overload + (NAT)

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When the student has completed this activity, the student + will be able to identify the IP address and port translations + that occur when using PAT.

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+ + Web Links

+ + +

About NAT

+ + http://www.homenethelp.com/web/explain/ about-NAT.asp

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