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Topic: Classful address

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	Classful Addressing (Site not responding. Last check: 2007-09-17)
		Classful addressing divides the entire IP address space (0.0.0.0 to 255.255.255.255) into 'classes', or special ranges of contiguous IP addresses (no addresses missing between the first and last address in the range).
		Classful addressing makes it posible to determine the network portion of the IP address by looking at the first four bits of the first octet in the IP address.
		The different classes of IP addresses (Class A, Class B, Class C, Class D and Class E) were created to allow for carving up the entire set of all IP addresses into chunks of different sizes that would 'fit' the number of hosts on the network for which the IP address space was being supplied.
	www.inetdaemon.com /tutorials/internet/ip/addresses/classful.shtml (611 words)

	Cisco - IP Subnet Calculation & Design
		Address Mask is an input that specifies the classful IP address mask using which the subnet calculation can be achieved.
		Address space is wasted because subnet zero and the last subnet can't be used, and also because the first address and the last address of the subnet can't be used (first address identifies the subnet itself, and last address is its broadcast address).
		This is not a class A, B, or C address.
	www.cisco.com /techtools/ip_addr_help.html (2194 words)

	S Y N G R E S S (Site not responding. Last check: 2007-09-17)
		By using the first octet in the address to identify the class of network, the protocol assumes the address is classful and uses the default subnet mask shown previously in Table 1.5.
		This addressing scheme is subnetted down using a 24-bit subnet mask, default Class C address, and a Class A value in the first octet.
		In a classful environment, this would be a Class C subnet mask and would result in an invalid combination, because the first octet would belong to a Class A, whereas the subnet mask would belong to a Class C. However, in a classless environment, this is a valid grouping.
	www.syngress.com /book_catalog/110_Avd_App/chapter_01.htm (6578 words)

	BSCN Study Guide Outline
		The boundary between the network and the host portion is defined by either the class of the address or the subnet mask associated with the address.
		Class D and E addresses are not actually used to provide address space, so we do not discuss the number of networks and hosts for these classes here.
		A Class B address is smaller than a Class A address, yet you are still allowed quite a large number of hosts.
	www.geocities.com /mehrankohan/chapter_two.htm (5415 words)

	Seminar - IP Addressing
		The address shortage problem is aggravated by the fact that portions of the IP address space have not been efficiently allocated.
		Class D addresses have their leading four-bits set to 1-1-1-0 and are used to support IP Multicasting.
		Class E addresses have their leading four-bits set to 1-1-1-1 and are reserved for experimental use.
	www.nextgendc.com /seminar_ip_addr.htm (1992 words)

	Subnet
		An IP address is a 32 bit binary number usually represented as 4 decimal values, each representing 8 bits, in the range 0 to 255 (known as octets) separated by decimal points.
		The Class of the address and the subnet mask determine which part belongs to the network address and which part belongs to the node address.
		In the example, 140.179.220.200 is a Class B address so by default the Network part of the address (also known as the Network Address) is defined by the first two octets (140.179.x.x) and the node part is defined by the last 2 octets (x.x.220.200).
	www.hitech-solutions.com /Subnet.htm (2588 words)

	Configuring Routing Information Protocol
		Summarizing IP addresses means that there is no entry for child routes (routes that are created for any combination of the individual IP addresses contained within a summary address) in the RIP routing table, reducing the size of the table and allowing the router to handle more routes.
		Note that the address family "notusingtimers" will use the system defaults of 30, 180, 180, and 240 even though timer values of 5, 10, 15, and 20 are used under the general RIP configuration.
		Address family timers are not inherited from the general RIP configuration.
	www.cisco.com /univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfrip.htm (3584 words)

	Understanding IP Addressing (Site not responding. Last check: 2007-09-17)
		The classful A, B, and C octet boundaries were easy to understand and implement, but they did not foster the efficient allocation of a finite address space.
		Since many hosts are classful, their user interface will not permit them to be configured with a mask that is shorter than the "natural" mask for a traditional classful address.
		As the demand for IP addresses continues to grow, it appears that it may be necessary to eventually allocate the 64.0.0.0/2 address space.
	www.bergen.org /ATC/Course/InfoTech/Coolip (12552 words)

	Classful Addressing (Site not responding. Last check: 2007-09-17)
		Classful addressing, formally adopted as part of the Internet Protocol (IP) in RFC 791, was the Internet's first major addressing scheme.
		An address was slotted into one of three address classes based on its high-order bits.
		For example, the U.S. Department of Defense, a very large network, was assigned a Class A; the University of Maryland, a typical mid-sized network, was assigned a Class B network; and a small consulting firm I once worked for was assigned a Class C network.
	www.freesoft.org /CIE/Course/Subnet/202.htm (392 words)

	About the NRO - The Internet Registry System
		The method by which the local part of an IP address is translated to a local network address depends on the architecture of the destination network— static tables, simple conversions, or special-purpose protocols are used as appropriate.
		In Class C, the high-order 3 bits are one-one-zero, the next 21 bits are the network, and the last 8 bits are the local address.
		The purpose of the Address Council, as described in the MoU, is to review and develop recommendations on issues related to IP address space, using the open processes that exist in the three regions; and to advise the ICANN Board on these matters.
	www.nro.net /about/rir-system.html (4989 words)

	[No title]
		We are going to analyse the common subnet masks for each Class, giving detailed examples for most of them and allowing you to "see" how everything is calculated and understand the different effects a subnet mask can have as you change it.
		We are looking at an IP Address with its subnet mask for the first time.
		When we use IP Addresses with their default subnet masks, e.g 192.168.0.10 is a Class C IP Address so the default subnet mask would be 255.255.255.0, then these are "Classful IP Addresses".
	www.firewall.cx /ip-subnetting-mask-effect.php (629 words)

	[No title]
		The IP Address Hierarchy Each 32-bit IP address is divided into A prefix a unique value known as network number A suffix a unique address on a given physical network¡&'j'jó¨18.4.
		The address assigned to a host is either class A, B, or C; the prefix identifies a network, and the suffix is unique to a host on that network.
		The original IP address scheme was extended to allow the division between prefix and suffix to occur on an arbitrary bit boundary.
	tiger.towson.edu /users/jwang2/chap18.ppt (2222 words)

	CIDR -- Classless InterDomain Routing
		which indicates starting address of the network, and number of 1s bits (22) in the network portion of the address.
		The use of a CIDR notated address is the same as for a Classful address.
		Classful addresses can easily be written in CIDR notation (Class A = /8, Class B = /16, and Class C = /24)
	www.ralphb.net /IPSubnet/cidr.html (613 words)

	NET 222: Introduction to Routers and Routing
		What are the classful subnet masks for classes A, B, and C? What formula tells you how many subnets can be made in a subnetting problem?
		Examine this problem, and answer each question using the methods from the chapter or from my notes.
		When you create a subnet, what two addresses on that subnet must not be assigned to hosts?
	home.att.net /~s.k.vincent/NET222rv2.htm (348 words)

	Classful IP Version 4 Address Allocations \| Networks \| Technical Support \| MOREnet
		Home » Technical Support » Networks and Workstations » TCP/IP » Classful IP Version 4 Address Allocations
		Version 4 IP addresses consist of a 32-bit binary number of four octets.
		Net ID Host ID Class C (16 Bit)
	www.more.net /technical/netserv/tcpip/classful.html (84 words)

	[No title]
		- ó¬¨ IP Addresses ª ó¨ IP Addressesª ó1¨What is an IP Address?
		Since external routers do not know about subnetting, the complexity of routing tables at external routers is reduced.
		An entire module devoted to IP addresses.¡. 2++ðH ð ð0“”Þ½h¿ÿ ?ð ÿÿÿÌ33ÌÌÌÿ²²²yº___PPT10Y+Dñ='ñ ¦ÿÿÿÿ=ñ @Bñ +îyï ð ðüð0ð( ð ðüðx ðü cð$Tÿ¿ÿð`0P ðÃ ð ðx ðü cð$0ÿÿ¿ÿð``P`ðÃÿ ð ðH ðü ð0“”Þ½h¿ÿ ?ð ÿÿÿÌ33ÌÌÌÿ²²²yº___PPT10Y+Dñ='ñ ¦ÿÿÿÿ=ñ @Bñ +î¹ï àðØpððpð( ð ððx ð cð$0&¿ÿð`0P ðÃ ð ðx² ð £ð
	www.cs.virginia.edu /~cs458/bookslides/module03-ipaddrV3.ppt (365 words)

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