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_2_4/buttons.html | 109 ++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/content.html | 141 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/index.html | 29 +++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/media.html | 21 +++ 4 files changed, 300 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/buttons.html new file mode 100644 index 0000000..25d14b4 --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_4/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +
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+ + 1.2 + DHCP 
  + 1.2.4 + DHCP operation 
+ + + + + + + +
+

+ The DHCP client configuration process uses the following steps:  +

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  1. + A client must have DHCP configured when starting the network + membership process. The client sends a request to a server + requesting an IP configuration. Sometimes the client may suggest + the IP address it wants, such as when requesting an extension to a DHCP lease. The client locates a DHCP server by sending a broadcast + called a DHCPDISCOVER.
    2. +
  2. + When the server receives the broadcast, it determines whether it can + service the request from its own database. If it cannot, the server + may forward the request on to another DHCP server. If it can, the DHCP server offers the client IP + configuration information in the form of a unicast DHCPOFFER. The + DHCPOFFER is a proposed configuration that may include IP address, + DNS server address, and lease time.
    3. +
  3. + If the + client finds the offer agreeable, it will send another broadcast, a DHCPREQUEST, specifically requesting those particular IP parameters. + Why does the client broadcast the request instead of unicasting it + to the server? A broadcast is used because the first message, the DHCPDISCOVER, may have reached more than one DHCP server. If more + than one server makes an offer, the broadcasted DHCPREQUEST allows + the other servers to know which offer was accepted. The offer + accepted is usually the first offer received.
    4. +
  4. + The server that + receives the DHCPREQUEST makes the configuration official by sending + a unicast acknowledgment, the DHCPACK. It is possible, but highly + unlikely, that the server will not send the DHCPACK. This may happen + because the server may have leased that information to another + client in the interim. Receipt of the DHCPACK message enables the + client to begin using the assigned address immediately.
    5. +
  5. + If the client detects that the address is already in use on the + local segment it will send a DHCPDECLINE message and the process + starts again. If the client received a DHCPNACK from the server after + sending the DHCPREQUEST, then it will restart the process again.
    6. +
  6. + If the client no longer needs + the IP address, the client sends a DHCPRELEASE message to the + server.
    7. +
+

+ Depending on an organization's policies, it may be possible for an end + user or an administrator to statically assign a host an IP address + that belongs in the DHCP servers address pool. Just in case, the Cisco + IOS DHCP server always checks to make sure that an address is not in + use before the server offers it to a client. The server will issue an + ICMP echo request, or will ping, to a pool address before sending the + DHCPOFFER to a client. Although configurable, the default number of + pings used to check for a potential IP address conflict is two.

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+ + Web Links

+ + +

DHCP Operation

+ + http://www.cs.utexas.edu/users/ + ypraveen/surveys/ DHCP/ node2.html

+ +

+

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+       +

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