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Topic: Subnet mask

	Dummies::Unmasking the Subnet Mask for the CCNA Exam
		A subnet mask, which contains a binary bit pattern of ones and zeros, is applied to an address to extract the network ID for purposes of determining whether an address is on the local network.
		The function of a subnet mask is to extract the network ID portion of an IP destination address and determine whether an IP address exists on the local network or whether it must be routed outside the local network.
		The default standard Class C subnet mask is 255.255.255.0 and its binary equivalent is 11111111 11111111 11111111 00000000.
	www.dummies.com /WileyCDA/DummiesArticle/id-2265.html (495 words)

	Subnetwork - Wikipedia, the free encyclopedia
		Subnetting is a hierarchical partitioning of the network address space of an organization (and of the network nodes of an autonomous system) into several subnets.
		Subnetting was originally introduced before the introduction of classful network addresses in IPv4, to allow a single larger network to have a number of smaller networks within it, controlled by several routers.
		The subnet mask is used in conjunction with the network address to determine which part of the address is the network address and which part is the host address.
	en.wikipedia.org /wiki/Subnet_mask (1047 words)

	Subnets and Subnet Masks
		The subnet mask is a value that allows the system to determine which are the network parts and which are the host parts of an IP address.
		The subnet mask is the code that determines which digits indicate the network and which indicate the host.
		A binary 1 in the subnet mask indicates that the corresponding bit in the IP address is treated as part of the network address.
	docsrv.sco.com /SM_nsm/subnet.htm (1621 words)

	Subnet and IP Subnetting
		Subnetting an IP Network can be done for a variety of reasons, including organization, use of different physical media (such as Ethernet, FDDI, WAN, etc.), preservation of address space, and security.
		IP networks are divided using a subnet mask which defines the boundaries of an IP subnet.
		Applying a subnet mask to an IP address allows you to identify the network and node parts of the address.
	www.networkdictionary.com /networking/subnet.php (453 words)

	Subnet Mask (Site not responding. Last check: 2007-10-23)
		The subnet mask indicates which portion of the IP address specifies the network address and which portion of the address specifies the host address.
		In this case, the subnet mask still interprets the destination host to be on the same subnet and the message is never routed.
		However, the network designers had intended the subnet mask to be 255.255.240.0, with four bits of the third octet used for the subnet and four bits as part of the host address.
	www.measureup.com /testobjects/MS_TCPIP4/5a8d0e7.htm (470 words)

	Subnet Mask Overview (Site not responding. Last check: 2007-10-23)
		Devices with dissimilar subnet masks may only be talked to through a gateway or routing device.
		If the "masked" bits of two IP addresses are the same, then the two addresses belong to the same subnet.
		Because it does not reside on this subnet, messages for this IP address must be sent to a gateway or routing device to be forwarded until a compatible subnet mask accepts them.
	www.sixnetio.com /htmlhelps/sixnetkb_new/subnet_mask_overview.htm (448 words)

	Internet Core Protocols: The Definitive Guide: Appendix B: IP Addressing Fundamentals
		Anywhere the subnet mask has a bit set to "1", the underlying bit in the IP address is part of the network address.
		Similarly, if a subnet mask shows that 16 bits are used for the host portion of the address block, a maximum of 65,536 possible host addresses are available for use on that network.
		The use of variable-length subnet masks as described in the preceding section was introduced to the Internet community in 1993 by RFC 1519 as a methodology for maximizing the utilization of limited IPv4 addresses.
	www.oreilly.com /catalog/coreprot/chapter/appb.html (3477 words)

	Subnet Masking Definition
		(In binary, a mask of 255.255.255.0 is 11111111.11111111.11111111.00000000.)
		(In binary, a mask of 255.255.255.192 is 11111111.11111111.11111111.
		A mask of 255.255.248.0 tells the corporate routers that the first 5 of those 16 is to identify the LAN segment, while a mask of 255.255.255.192 tells the corporate routers that the first 10 of those 16 is to identify the LAN segment.
	www.exabyte.net /lambert/subnet/subnet_masking_definition.htm (599 words)

	IP Subnet Calculations
		The default subnet mask for a class B is 255.255.0.0.
		The default subnet mask for a class C is 255.255.255.0.
		To subnet, the default subnet mask for a network is extended to cover bits of the address that would otherwise be part of the host field.
	www.swcp.com /~jgentry/topo/unit3.htm (1664 words)

	TCP/IP Subnet Chart
		Number of Subnets - "()" Refers to the number of effective subnets, since the use of subnet numbers of all 0s or all 1s is highly frowned upon and RFC non-compliant.
		A subnet mask of 255.255.255.0 means that the first three octets of the address will be used for the network, and thus our network number is 192.168.1.
		Subnetting is when you use bits from the host portion of your address as part of your network number.
	www.pantz.org /networking/tcpip/subnetchart.shtml (1681 words)

	IP Addresses, Subnet Masks, and Subnetting (Site not responding. Last check: 2007-10-23)
		In this diagram, the 192.168.2.0 subnet is known as a "stub subnet"; the process of pretending you are hosts you're not, in order to facilitate routing packets to a stub subnet, is known as "proxy arp." No two hosts on the Internet can have the same IP address.
		When using a subnet mask of 255.255.0.0, the first two bytes indicate the network you're on, and the last two bytes indicate the host you are on that network.
		Subnet masks are often abbreviated using a forward slash "/" and the number of ones in the mask.
	home.earthlink.net /~mara07/IPAddresses.htm (2701 words)

	More Restrictive Subnet Masks
		When a bitwise logical AND operation is performed between the subnet mask and IP address, the result defines the Subnet Address (also called the Network Address or Network Number).
		Multiplying the number of subnets by the number of nodes available per subnet gives you the total number of nodes available for your class and subnet mask.
		You can calculate the Subnet Address by performing a bitwise logical AND operation between the IP address and the subnet mask, then setting all the host bits to 0s.
	www.ralphb.net /IPSubnet/restr.html (448 words)

	Binary Numbers and Subnet Masks
		Subnet masks, like the IP address itself, is 32 bits in length.
		Subnet masks are composed of some number of 1 bits followed by enough 0 bits to form a 32-bit value, where the bit positions with a 1 correspond with the bit positions in the IP address that are part of the NET_ID.
		In the parlance of subnet masking, these masks would be said to be 8, 16, or 24 bits in length but that is a misnomer; it really only refers to the number if one bits since masks really are always 32 bits long.
	www.garykessler.net /library/subnet_masks.html (1060 words)

	IPCP Subnet Mask Support Enhancements
		If the subnet mask is specified by the Framed-IP-netmask attribute in the RADIUS user profile, the Cisco 6400 passes the mask and IP address to the CPE during IPCP negotiation.
		Specifies to request the subnet mask from the peer.
		To verify that your CPE is hard-coded to request the subnet mask from the peer, refer to the user documentation for your CPE.
	www.cisco.com /univercd/cc/td/doc/product/software/ios121/121newft/121limit/121dc/121dc3/ipcp_msk.htm (1466 words)

	What is subnet mask? - A Word Definition From the Webopedia Computer Dictionary
		Subnetting enables the network administrator to further divide the host part of the address into two or more subnets.
		The subnet mask is the network address plus the bits reserved for identifying the subnetwork.
		It's called a mask because it can be used to identify the subnet to which an IP address belongs by performing a bitwise AND operation on the mask and the IP address.
	www.webopedia.com /TERM/S/subnet_mask.html (330 words)

	Subnet Mask
		Which portion of the address identifies the net and subnet and which portion identifies the station are left up to the networking administrators to determine.
		The Subnet Mask is a bit pattern which is used to mask off the network portions from the station portions of the address.
		Missouri State University currently uses the subnet mask 255.255.255.0 for backbone segments and for non-VLANs and 255.255.254.0 for VLAN applications.
	networking.missouristate.edu /general/glossary/subnet.htm (421 words)

	techtutorials.net - Subnetting Reference (Site not responding. Last check: 2007-10-23)
		The "Masked Bits" column refers to the number of bits in the bit pattern that are "masked" ("1") for use as subnet addresses.
		Finally, the subnet mask is determined by converting the bit pattern to decimal.
		Now it is the subnet mask that tells us (and more importantly the computer) how many of the bits will be used as the network id. The 1's represent the portion that is the network id. In this case is is the left-most 20 bits (20 1's).
	www.techtutorials.net /tutorials/networking/subnetting.shtml (1826 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.
		In this page we saw the default subnet mask of each Class and also introduced the Classful and Classless IP Addresses, which are a result of using various subnet masks.
		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)

	What Is A Subnet Mask? IP AND Address Class Reserved Network (Site not responding. Last check: 2007-10-23)
		Assuming this is part of a Class B network, the first two numbers (150.215) represent the Class B network address, and the second two numbers (017.009) identify a particular host on this network.
		Subnetting enables the network administrator to further divide the host part of the addr.
		It's called a mask because it can be used to identify the subnets to which an IP addr.
	bugclub.org /beginners/networking/SubnetMask.html (211 words)

	Subnet Addressing (Site not responding. Last check: 2007-10-23)
		A subnet mask (or number) is used to determine the number of bits used for the subnet and host portions of the address.
		The mask is a 32-bit value that uses one-bits for the network and subnet portions and zero-bits for the host portion.
		For instance, a subnet of 7 (all one bits) is reserved for an all subnets-directed broadcast (a broadcast sent to all subnets of the specified subnetted network) when the host bits are all one.
	www.networkcomputing.com /unixworld/tutorial/001.html (1620 words)

	Get a Clue: Calculating Subnet Masks
		If we were to use an address with a subnet mask of 255.255.0.0 then the first 2 segments would make up the network address and the last two would be the host address.
		For a subnet mask of 255.255.255.240 That is pretty much it with creating subnet masks, but now you need to learn a new rule about addressing.
		First lets say we have a network subnet of 10.10.10.X and we are using the same subnet mask 255.255.255.192 Our network host (HOST1) is currently using the address 10.10.10.75 Now lets display the binary of the last segment for both the subnet mask and the address of our host.
	www.networkclue.com /routing/tcpip/calculating-masks.php (1318 words)

	Subnet mask (Site not responding. Last check: 2007-10-23)
		A subnet mask is the same basic thing as a netmask with the only real difference being that you are breaking a larger organizational network into smaller parts, and each smaller section will use a different set of address numbers.
		The subnet that the computer is on is determined by the netmask and IP address of the computer.
		If the subnet of the destination address is the same as the subnet of the local computer, the packet is sent out on the network to the destination address.
	www.comptechdoc.org /independent/networking/terms/subnet-mask.html (214 words)

	Formula for defining a Subnet Mask (Site not responding. Last check: 2007-10-23)
		Determine the class and the default subnet mask of the IP address you have been given.
		The remaining bits to the right hand side of the subnet mask will be used to represent the host portion of the IP address.
		List each subnet address starting with the incremental value determined in step 2 and increasing by that value until the total number of available subnets is reached.
	www.mindwerks.org /Subneting.htm (845 words)

	Subnet masks
		The subnet mask is a 32-bit value that usually expressed in the same dotted-decimal notation used by IP addresses.
		The purpose of the subnet mask is to let IP separate the network ID (or, as you saw in preceding example, part of the network ID) from the full IP address and thus determine whether source and destination are on the same network
		When IP applies the subnet mask to an IP address, the part of that mask is all 0's strips off the corresponding section of the address.
	library.thinkquest.org /28289/subnet.html (436 words)

	IP Subnet Mask Calculator :: Webmaster Tools
		Each subnet functions as though it were independent, keeping traffic local and forwarding traffic to another subnetwork only if the address of the data is external to the subnetwork.
		To create the subnet mask, first remember that the purpose of the subnet mask is to separate the (32 bit) ip address into the network prefix and the host number.
		If a bit in the subnet mask is 1, the corresponding bit in the IP address is part of the network address; if the bit in the subnet mask is 0, the corresponding bit in the IP address is part of the host address.
	webtools.live2support.com /nt_subnet.php (456 words)

	Online IP Subnet Calculator
		Results of the subnet calculation provide the hexadecimal IP address, the wildcard mask, for use with ACL (Access Control Lists), subnet ID, broadcast address, the subnet address range for the resulting subnet network and a subnet bitmap.
		The subnet calculator allows the use of a single subnet bit - for example, a class C address with a subnet mask of 255.255.255.128 is permitted.
		The subnet calculator allows a subnet ID to have its final octet equal to the final octet of its subnet mask - for example, a class C network address of 192.168.0.192 with a subnet mask of 255.255.255.192 is permitted.
	www.subnet-calculator.com /subnet.php (284 words)

	Subnet Mask Table
		The first line of each Subnet Mask shows the range of usable IP addresses; this is the maximiun number of devices you can use with the corresponding Subnet Mask.
		Subnet Masks accompany an IP address and the two values work together.
		Applying the subnet mask to an IP address splits the address into two parts, a "Class B Network" or "Extended network address" and a host address (device).
	www.easydesksoftware.com /subnet.htm (146 words)

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