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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_8/buttons.html | 109 +++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/content.html | 249 +++++++++++++++++++++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/index.html | 29 +++ Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/media.html | 21 ++ 4 files changed, 408 insertions(+) create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/buttons.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/content.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/index.html create mode 100644 Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/media.html (limited to 'Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8') diff --git a/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/buttons.html b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/buttons.html new file mode 100644 index 0000000..ba89bdb --- /dev/null +++ b/Bachelor/CCNA4/en_CCNA4_v30/ch1/1_2_8/buttons.html @@ -0,0 +1,109 @@ + + + + + + + + + + + +New Page 1 + + + + + + + + + + + + + + + + + + + + + + + +

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+ +	1.2		+ DHCP
	+ 1.2.8		+ DHCP relay

+ + + + + + +

+ + DHCP clients use IP broadcasts to find the DHCP server on the segment. + What happens when the server and the client are not on the same + segment and are separated by a router? Routers do not forward these + broadcasts.

+ + DHCP is not the only critical service that uses broadcasts. Cisco + routers and other devices may use broadcasts to locate TFTP servers. + Some clients may need to broadcast to locate a TACACS server. A TACACS + server is a security server. Typically, in a complex hierarchical + network, clients reside on the same subnet as key servers. Such remote + clients will broadcast to locate these servers. However, routers, by + default, will not forward client broadcasts beyond their subnet.

+ + Because some clients are useless without services such as DHCP, one of + two choices must be implemented. The administrator will need to place + servers on all subnets or use the Cisco IOS helper address feature. + Running services such as DHCP or DNS on several computers creates + overhead and administrative difficulties making the first option + inefficient. When possible, administrators should use the + + ip helper-address + command to relay broadcast requests for these key UDP services.

+ + By using the helper address feature, a router can be configured to + accept a broadcast request for a UDP service and then forward it as a + unicast to a specific IP address. By default, the + + ip helper-address + command forwards the following eight UDP services:

+ + Time
+ + TACACS
+ + DNS
+ + BOOTP/DHCP Server
+ + BOOTP/DHCP Client
+ + TFTP
+ + NetBIOS Name Service
+ + NetBIOS datagram Service

+ + In the particular case of DHCP, a client broadcasts a DHCPDISCOVER + packet on its local segment. + This + packet is picked up by the gateway. If a helper-address is configured, + the DHCP packet is forwarded to the specified address. Before + forwarding the packet, the router fills in the GIADDR field of the + packet with the IP address of the router for that segment. This + address will then be the gateway address for the DHCP client, when it + gets the IP address. +

+ + The DHCP server receives the discover packet. The server uses the GIADDR field to index into the list of address pools, to find one + which has the gateway address set to the value in GIADDR. This pool is + then used to supply the client with its IP address. + +

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+ + + + + Lab Activity
+ +
Lab Exercise: Configuring DHCP Relay
+
In this lab, a router will be configured for Dynamic Host + Configuration Protocol (DHCP).
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+ + + + Lab Activity
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e-Lab Activity: Configuring DHCP Relay
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In this lab, the student will configure a router for DHCP, add the ability for workstations to remotely obtain DHCP + addresses and dynamically assign addresses to the attached + hosts.
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+ + Web Links
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Configuring DHCP Relay, DHCP Server, and PAT
+ + http://www.cisco.com/univercd/cc/td/ + doc/product/ ccess/acs_fix/750/ + cfgguide/700cgdhc.htm
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