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Quite a few different protocols can be filtered using an access list A short list includes IP, IPX, AppleTalk, DECnet, VINES, and XNS It is also possible to filter on MAC layer addresses Within most protocol stacks, there are usually additional protocols that can be filtered For example, filters can also be created for TCP, UDP, and ICMP, all of which use IP at the network layer [source address and mask] The source address and mask of the packets is always required The source address is normally the layer 3 address of the packet, unless the access list is a MAC layer filter The mask portion tells the router how much of the address to match when filtering packets The concept is similar to a subnet mask For instance, you may want to match all packets originating from the 101000 25525500 subnet The mask allows you to tell the router to match only the first two octets of the address If no mask is specified, an exact match is assumed If 101000 is typed, the access list entry would only match packets with a source address of 101000 (a very unlikely source address) Although the principle is the same, the syntax of this mask is different than a network mask We cover this topic in greater detail later In addition to the use of an actual address, many protocols also support the use of the "any" keyword [source port number or range] This field is used when filtering on layer 4 information It allows you to specify a particular higherlayer port If the access list protocol is TCP, for example, you could specify a source TCP port of 25 (SMTP) You can also use symbols like GT for "greater than," LT for "less than," and RANGE to create specific ranges of port numbers [destination address and mask] This field has the same parameter structure as the source address and mask [destination port number or range] This field has the same parameter structure as the source port number or range [options] This field allows a variety of additional fields to be matched in the access list entry The contents of the field vary depending on the type of access list A typical option for a TCP access list would be "established," indicating the access list entry would examine the packet to see if the ACK or RST bit is set The "log" option is also common, indicating that matches of the access list entry should be logged to the router's buffer or a syslog server Other options include filtering on TOS and IP precedence We will cover each of these fields for particular IP access lists later in this chapter Access lists for other protocols will be discussed in later chapters. asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... There are a few IP addresses that are illegal to assign to hosts on the network You might wonder why a class C address can have only 254 hosts and not 256, as would seem more likely, since an 8-bit number can have 256 possible values The reason for this seeming discrepancy is that two of the addresses are lost from the available host pool The first is an address that has all bits set to 0s in the host ID, which signifies the network ID of the network The second is an address that has all bits set to 1s in the host ID, which signifies the broadcast address for the network So, for example, in the class C network 200158157x, the addresses 2001581570 (the network ID) and 200158157255 (the broadcast address) are not available to hosts, reducing the available number of hosts from 256 to 254 Another illegal address to assign to a host on the network is any system that has the first octet of 127; remember that this is reserved as the loopback address and you will not be able to assign the address to any host asp.net upc-a Barcode UPC-A - CodeProject
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... We can see that network 2 must support 50 usable addresses, and network 1 must support 10 If network 2 has the most hosts at one site on the internetwork, and we are using RIP or IGRP, we would have to assign a netmask of 255255255192, which gives us 62 usable addresses on each subnet This would waste 52 usable addresses on network 1 With EIGRP we can assign a netmask of 255255255192 to the Ethernet 0 port of router 2 and a 255255255240 to the Ethernet 0 port of router 1 EIGRP will transmit this netmask information in its updates and routing table integrity will be maintained 4: behind a Network Address Translation (NAT) server that will translate the private address to a public address that can be routed on the Internet For more information on NAT, refer to the section Network Services later in this chapter asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
This ASP . NET barcode library could easily create and print barcode images using .Net framework or IIS. UPC-A ASP . NET barcode control could be used as a ... asp.net upc-a UPC-A a.k.a as Universal Product Code version A, UPC-A ...
The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... The code below is a portion of a sample access list configuration for a Cisco router applied to the serial 0 interface Only the relevant portions of the configuration are shown interface Serial0 ip address 17010101 2552552550 ip access-group 101 in ! access-list 101 permit tcp any any established access-list 101 permit udp any gt 1023 host 160102100 eq 53 access-list 101 permit ip any host 160102101 access-list 101 permit icmp any any echo-reply Figure 7 1 shows the router this sample configuration is taken from When sending data on the network, there are different ways that the data can be sent to the destination The data can be sent to a unicast address, a broadcast address, or a multicast address The following outlines the difference between unicast, broadcast, and multicast: .
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