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Network Security Protocols in Practice Part I docx
... Payload J Wang Computer Network Security Theory and Practice Springer 2009 Key Determination and Distribution Oakley key determination protocol (KDP) Diffie-Hellman Key Exchange + authentication...
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Tài liệu TCP/IP and tcpdump pdf
... 4-byte boundary) 68 Timestamp End of Options list No operation (pad) 131 Loose source route 137 Strict source route Record route ECN bits (used when ECN employed; else 00) CWR (1 = sender has cut...
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Practical TCP/IP and Ethernet Networking- P1 pptx
... Practical Electrical Network Automation and Communication Systems (Cobus Strauss) Practical Embedded Controllers (John Park) Practical Fiber Optics (David Bailey, Edwin Wright) Practical Industrial Data ... Installation and Troubleshooting (Steve Mackay, Edwin Wright, John Park, Deon Reynders) Practical Industrial Safety, Risk Assessment and Shutdown Systems for Instrumentation and Control (Dave Macdonald) ... 8.3 /TZKXTGR ,:6 IUSSGTJY ,:6 [YKX IUSSGTJY 'TUT_SU[Y ,:6 137 8.4 8.5 8.6 8.7 Trivial file transfer protocol (TFTP) /TZXUJ[IZOUT ,XGSK Z_VKY TELNET (telecommunications...
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Practical TCP/IP and Ethernet Networking- P2 ppt
... implementation of TCP/IP in computer and industrial applications Troubleshooting and maintenance of TCP/IP networks and communications systems in an office and industrial environment will also be covered ... great interest has been the strong movement to universal usage by the hitherto disinterested industrial and manufacturing spheres of activity who have traditionally used their own proprietary protocols ... troubleshooting TCP/IP and LANs Apply the TCP/IP suite of protocols to both an office and industrial environment Typical people who will find this book useful include: • • • • • • • • • • • •...
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Practical TCP/IP and Ethernet Networking- P3 ppsx
... energy This effect is known as signal attenuation With electrical signaling some materials such as copper are very efficient conductors of electrical energy However, all conductors contain impurities ... resist the movement of the electrons that constitute the electric current The resistance of the conductors causes some of the electrical energy of the signal to be converted to heat energy as ... link control (SDLC) or high level data link control (HDLC) for synchronous transmissions • Industrial protocols such as manufacturing automation protocol (MAP), technical office protocol (TOP),...
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Practical TCP/IP and Ethernet Networking- P4 ppsx
... channels are subject to noise, particularly where equipment is situated in industrial environments with high electrical noise, such as electromagnetic radiation from adjacent equipment or electromagnetic ... TKZ]UXQY 2UIGR GXKG TKZ]UXQY 2'4Y LANs are characterized by high-speed transmission over a restricted geographical area Thick Ethernet (10Base5), for example, operates at 10 Mb/s over a maximum...
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Practical TCP/IP and Ethernet Networking- P5 pps
... converts the electrical signals into a series of bit values These values are grouped into packets and passed up to the data link layer :XGTYSOYYOUT VXUVKXZOKY JKLOTKJ The mechanical and electrical properties ... protocol stack Error correction and detection techniques are used here • Physical Defines the electrical and mechanical connections at the physical level, or the communication channel itself Functional ... from the data link layer above it, and converts the contents of these packets into a series of electrical signals that represent and values in a digital transmission These signals are sent across...
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Practical TCP/IP and Ethernet Networking- P6 pdf
... always available A more restrictive definition requires each node to be connected directly to every other node Because of the severe connection requirements, such restrictive mesh topologies are ... layout for a network This specifies how the elements in the network are connected to each other electrically This arrangement will determine what happens if a node on the network fails Physical topologies ... these can be used to form 4KZ]UXQOTM L[TJGSKTZGRY hybrid topologies to overcome weaknesses or restrictions in one or other of these three component topologies ([Y ZUVURUM_ A bus refers to both...
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Practical TCP/IP and Ethernet Networking- P7 pptx
... be recognized: • The cable is not very resistant to electrostatic electrical noise, and may not be suitable for some industrial environments Whilst the cable is inexpensive, there is the additional ... connection to the cable This is a mechanical connection that clamps directly over the cable Electrical connection is made via a probe that connects to the center conductor and sharp teeth, which ... 3.1 10Base5 hardware components The location of the connection is important to avoid multiple electrical reflections on the cable, and the Thicknet cable is marked every 2.5 meters with a black...
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Practical TCP/IP and Ethernet Networking- P8 ppsx
... traffic can contribute to the traffic (and the collision rate) +ZNKXTKZ JKYOMT X[RKY The following design rules on length of cable segment, node placement and hardware usage should be strictly ... FFFFFFFFFFFF • Multicast First bit of the destination address is set to a It provides group restricted communications • Individual, or point-to-point First bit of the address set to 0, and the ... the node to delay transmission at each attempt After ten attempts, the node will attempt more retries, but the slot times available for the delay period will remain as they were at the tenth attempt...
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Practical TCP/IP and Ethernet Networking- P9 ppsx
... reference To avoid this situation, a string of code words of weight +1 is always sent by inverting alternate code words before transmission Consider a string of consecutive data bytes 40H, the ... has a combined weight of while 40H is –00+0+, which has a combined weight of +1 If a continuous string of code words of weight +1 is sent then the mean signal will move away from zero, known as ... on the delay in the cable and the time delay in the repeaters and NIC delays The maximum round-trip delay for 100Base-T systems is the time to 66 Practical TCP/IP and Ethernet Networking transmit...
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Practical TCP/IP and Ethernet Networking- P10 pptx
... other One of the major reasons why TCP/IP has become the de facto standard world-wide for industrial and telecommunications applications is the fact that the Internet was designed around it in ... line internet protocol (SLIP), described in RFC 1055 Frame relay, described in RFC 1490 Fiber distributed data interface (FDDI), described in RFC 1103 (Note: Any Internet-related specification ... implies, is used for the transfer of files between two hosts using TCP It is described in RFC 959 • Trivial file transfer protocol (TFTP), which is an economic version of FTP and uses UDP instead...
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Practical TCP/IP and Ethernet Networking- P12 ppt
... to be further distributed via the three regional registries (ARIN, RIPE and APNIC), who could possibly further delegate the allocation of sub-ranges to national or regional registries such as the ... options Changes in the way IP header options are encoded allows for more efficient forwarding, less stringent limits on the length of options, and greater flexibility for introducing new options in ... MAC addresses are converted to EUI-64 format by splitting them in the middle and inserting the string FF-FE in between the two halves 6XGIZOIGR :)6/6 GTJ +ZNKXTKZ 4KZ]UXQOTM Figure 6.22...
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Practical TCP/IP and Ethernet Networking- P13 pot
... hardware address to change, as happens when an Ethernet interface fails and has to be replaced, entries in an ARP cache have a limited life span after which they are deleted Every time a machine ... as the requesting node Assume that a router connects two subnets, A and B If host A1 on subnet A tries to send an ARP request to host B1 on subnet B, this would normally not work as an ARP can ... to recover its IP address from an address file on a remote server at startup It uses RARP to retrieve its IP address A diskless workstation broadcasts an RARP request on the local network using...
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Practical TCP/IP and Ethernet Networking- P14 ppt
... metric used is: Metric = K1 * bandwidth + (K2 * bandwidth)/(256 – Load) + K3 * Delay (K1, K2 and K3 are weighting factors.) Reliability is also added in using the metric: Metricmodified = Metric ... table updates, but at 90 second intervals Each of the metrics used in the calculation of the distance vectors has a weighting factor The metrics used in the calculation are as follows: • Hop count ... +ZNKXTKZ 4KZ]UXQOTM It is also possible for a network administrator to make static entries into routing tables These entries will not change, even if a router that they point to is not operational ...
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Practical TCP/IP and Ethernet Networking- P16 pdf
... PWD LIST NLST SITE SYST STAT HELP[]CRLF NOOP Remove directory Make directory Print working ... transfer operation • File already exists • No such user Error message: Variable length string This is Netascii string, terminated by a byte TELNET (telecommunications network) TELNET is a simple remote ... are commonly used by Internet sites such as Network Information Systems, Yellow Pages, etc 8.3 Trivial file transfer protocol (TFTP) 8.3.1 Introduction TFTP (RFC 1350) is a less sophisticated...
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Practical TCP/IP and Ethernet Networking- P17 docx
... number of domain names is so large that the namespace is distributed across multiple servers, called authoritative servers, in different countries For example, all the co.za domain names (i.e South ... somewhere on the internetwork There is usually more than one DNS server, and the database may be distributed among them Where an individual DNS server does not have access to the entire database, ... registered only through Network Solutions Country codes As the Internet backbone was extended into countries other than the USA, the top-level domain names were extended with a two-letter country code...
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Practical TCP/IP and Ethernet Networking- P18 doc
... instances in a list, it does not provide any values • The GetNext operation is used by the NMS to retrieve the value of the next object instance in a table or list within an agent • The Set operation ... protocol operations: GetBulk and Inform: • The GetBulk operation is used by the NMS to efficiently retrieve large blocks of data, such as multiple rows in a table GetBulk fills a response message with ... for all the variables in a list, it provides partial results 8.9.5 SNMP management SNMP is a distributed-management protocol A system can operate exclusively as either an NMS or an agent, or it...
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