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The most powerful layer 2 filters that can be created are byte offset filters These filters enable you to block layer 2 packets based on arbitrary fields in the layer 2 packet The syntax of a byte offset filter is shown in the following line: access-list access-list-number {permit | deny} source source-mask destination destination-mask offset size operator operand The access-list-numberis a number between 1,100 and 1,199 The sourceand source-maskidentify the source MAC address The destinationand destination-maskidentify the destination MAC address The offsetis the number of bytes the fields you are matching are offset from the destination MAC address not the start of the packet The destination MAC address field starts eight bytes into the Ethernet packet To calculate the offset, subtract eight from the number of bytes between the beginning of the packet and the beginning of the field you are filtering The sizefield is the number of bytes you are matching, between one and four The operatorfield is a keyword used to compare the arbitrary bytes in the field, such as EQ for equal, NEQ for not equal, LT for less than, and GT for greater than The operandfield is the field against which you are comparing the arbitrary bytes The use of byte offset filtering is best illustrated with an example In the following filter, we are comparing two bytes (0x1e) that are 24 bytes (32 8) into the packet to see whether the value is equal to (eq) 0x1F1C:

q Tx/Ex-Carriers are widely used and very popular q They are used as a backbone by telephone companies q They are very expensive

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PPP is the more modern point-to-point protocol; key features are that it supports the simultaneous running of multiple protocols over one link, synchronous as well as asynchronous communications, dynamic address assignment, and authentication PPP is a layer 2 (Data Link) protocol; there is, however, a whole link negotiation process that must be completed before two nodes can exchange information at the Data Link level Let's examine this negotiation process as a set of phases The first phase comprises exchange of Link Control Protocol packets This is like an initial introduction The two ends agree on the general characteristics of the communication that is about to take place, such as the use of compression or the maximum frame size An optional phase checks the line quality to see if it can be used to bring up the Network layer protocols Once the link configuration is agreed upon, an optional authentication process may take place, via either the PAP or CHAP protocol The Password Authentication Protocol (PAP) was the first authentication protocol deployed for PPP To explain the way it works, imagine you have a remote PC using a dial connection to

The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question

1 Which switching technology is used by the telephone company A Packet B Circuit C WAN D Hub 2 Which switching method allows for data transmissions even when part of the network fails A Packet B Circuit C WAN D Hub

3 In which area networking environments is ATM usable A Dial-up B Workgroup C WAN D LAN 4 What is the size of a cell in an ATM network A 48 bytes B 5 bytes C 53 bytes D 512 bytes

Interface ethernet 0 bridge-group 1 input-pattern 1100 ! access-list 1100 permit 000000000000 ffffffffffffffff 000000000000 ffffffffffffffff 0x1e 2 eq 0x1f1c access-list 1100 deny 000000000000 ffffffffffffffff The format of these types of access lists can be modified to filter only on source and destination MAC address: Interface ethernet 0 bridge-group 1 input-pattern 1100 ! access-list 1100 permit 008000000000 000fffffffffffff 00c012345678 ffffffffffffffff access-list 1100 deny 000000000000 ffffffffffffffff This filter permits layer 2 packets if the source MAC address begins with 008 and the destination MAC address is 00c012345678 All other layer 2 packets are denied

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5 How many streams does the SONET network transfer A 1 B 2 C 3 D 4 or more 6 Which of the following is in the form of electrical pulses on a SONET network A STM B STS C PTE D LTE 7 What can be used in a SONET network to allow a user s data to remain private A Multiplexer B PTE C LTE D Scrambler 8 What is the speed of one SONET level A 3224 Mbps B 5184 Mbps C 6408 Mbps D 15552 Mbps

9 What levels are the OC levels matched to A ATM B SDH C SONET D T1 10 What is the highest OC level A 32 B 64 C 128 D 192

The final type of layer 2 filtering we will examine is the use of access expressions An access expression is the joining of a source MAC address filter and a Type of LSAP filter to create a composite expression For example, suppose we wished to allow packets only if they were from MAC address 008012345678 and if they were SNA frames (LSAP type 0x0404 0x00010) The following commands create the access expression: Interface ethernet 0 Access-expression in lsap(200) & smac(700) ! access-list 200 permit 0x0404 0x0101 ! access-list 700 permit 008012345678 000000000000 Notice the command access-expression is applied to the Ethernet 0 interface The ampersand (&) symbol designates an AND condition and means that both conditions must be met The straightline (|) symbol designates an OR condition, and a tilde (~) symbol indicates a NOT condition Parentheses can be used in access expressions to create complex conditions The following example shows an addition to the access expression that permits packets not only if they are from source MAC address 008012345678 and SNA but also if they are NetBIOS packets Interface ethernet 0

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