chapter 6  internet control message protocol

... subnet bị dấu địa định dạng IPv4 không cần thiết Bảng 2: Comparsion of query message in ICMPv4 and ICMPv6 Type of message Echo Request And Reply Timestamp Request And Reply Address mask Request ... MTU Gói liệu phận IP nhận bao gồm đầu mục IP cộng với byte liệu gói liệu Hình 37 : Packet too big message format 2.1.3 Time Exceeded ( Vượt thời gian): - Thông điệp gần giống với kiểu thông điệp ... Gói liệu phận IP nhận bao gồm đầu mục IP cộng với byte liệu gói liệu Hình 39: Parameter- problem message format 2.1.5 Redirection (Sự gửi lại lần nữa): - Mục đích thông điệp giống với mô tả phiên...

Ngày tải lên: 05/10/2013, 20:20

... to communicate like the transport protocols ICMP messages can get lost and not be delivered ICMP messages are never used to deliver an error about other ICMP messages because that might cause ... traffic is: a) One ICMP message can be sent to multiple hosts b) ICMP is a transport layer protocol c) ICMP is an application layer protocol d) ICMP is an unreliable protocol 12) Loki is such ... has a special place among the protocols; it is unlike TCP and UDP, yet still uses IP as its network protocol We’ll see exactly where ICMP fits in among the other protocols and the function that...

Ngày tải lên: 04/11/2013, 13:15

... ICMP Message Structure ICMP controls the data being transmitted over the network through the use of numerous message types Each ICMP message type contains specific formatting ... request messages make up the other half of the messages used by the ping utility As the name implies, an echo request message requests that the target host respond with an echo reply message ... host itself - Protocol unreachable (Code 2) This typically indicates that the network protocol (for example, TCP or UDP) cannot be reached - Port unreachable (Code 3) Similar to protocol unreachable,...

Ngày tải lên: 26/01/2014, 04:20

... messages: • Error messages • Information messages Error Message Categories • • • • Destination Unreachable Packet too big Time exceeded Parameter problem Informational Messages • Diagnostic messages ... Internet Command Message Protocol (ICMP) • RFC 792 • Used to communicate IP status and error messages between host and routers ICMP • Used to communicate IP status and error messages between ... management messages • Neighbor discovery messages • Every ICMPv6 message is preceeded by an IPv6 header and or more IPv6 extension headers • A next header field of 58 nidentifies the ICMPv6 message...

Ngày tải lên: 23/03/2014, 00:20

... to keep their messages confidential If A wishes to hide the contents of a message to B, A encrypts 204 INTERNET SECURITY A’s private key User A Message digest One-way hash function Message (M) Signature ... content of a message m is reduced to a message digest with a hash function (such as MD5) An octet string containing the message digest is encrypted with the RSA private key of the signer The message ... function Message digest computed at B S Decryption A’s public key Message digest Comparison ? = Yes Accept If the comparison is successful, It is authentic No Reject If the comparison fails, the message...

Ngày tải lên: 09/08/2014, 06:23

... The Internet Layer Protocols 在 DoD 模型中,Internet 层负责:路由,以及给上层提供单独的网络接口 Internet Protocol( IP) IP 协议查找每个数据包(packets)的地址,然后,根据路由表决定该数据包下 段路径该如何走, 寻找最佳路径 Internet Control Message Protocol( ICMP) ICMP ... User Datagram Protocol( UDP) UDP 协议的最他特点是无连接(connectionless),即不可靠,因为它不与对方进行协商并连接,它 也不会给数据段标号,也不关心数据段是否到达接受方 Key Concepts of Host-to-Host Protocols 现在把 TCP 协议和 UDP 协议的一些特性做个比较: ... 5.Traceroute:根据 ICMP 协议信息来跟踪数据在网络上的路径,经过哪些跳 Address Resolution Protocol( ARP) 地址解析协议(ARP)用于根据 个已知的 IP 地址查找硬件地址.它把 IP 地址翻译成硬件地址 Reverse Address Resolution Protocol( RARP) RARP 协议用于把 MAC 地址翻译成 IP 地址 IP Addressing...

Ngày tải lên: 09/12/2013, 17:15

Ngày tải lên: 14/12/2013, 12:15

... Classful IP Addressing  Classful Routing Protocols  Classless IP Addressing  Classless Routing Protocols Classful and Classless Routing Protocols  Routing protocols:  classful or classless  ... Classless Routing Protocol  Classless routing protocols include the subnet mask with the network address in their routing updates 17 Classless Routing Protocol  With a classless routing protocol:  ... Only classless routing protocols can propagate supernets  Classless routing protocols include both the network address and the mask in the routing update  Classful routing protocols cannot include...

Ngày tải lên: 23/02/2014, 09:20

... communications device, such as a modem Chapter 6: The Internet Internet Protocols, Addresses, and Domains Chapter 6: The Internet Internet Protocols, Addresses, and Domains A domain name is a key component ... addresses on the Web called URLs Chapter 6: The Internet Internet Protocols, Addresses, and Domains Chapter 6: The Internet 10 Internet Protocols, Addresses, and Domains The first step in registering ... allows people to exchange short messages while they are online – Instant messaging (IM) – Chat Chapter 6: The Internet 29 Voice over IP  VoIP (Voice over Internet Protocol) or Voice over IP, is...

Ngày tải lên: 06/03/2014, 09:21

... classless routing protocols –Classless routing protocols include the subnet mask in routing updates and are not required to perform summarization i ti –The classless routing protocols discussed ... supernet routes requires a classless routing protocol, because the subnet mask can no longer be determined by the value of the first octet •Classless routing protocols include the subnet mask with ... mask of /16 –In a classful routing protocol scenario, R3 is unaware of the 172.17.0.0/16, 172.18.0.0/16 and 172.19.0.0/16 networks –With a classless routing protocol, R2 will advertise the 172.16.0.0...

Ngày tải lên: 05/07/2014, 03:20

... transport ] [ protocol ] "aaas://" FQDN [ port ] [ transport ] [ protocol ] port transport protocol = ":" 1*DIGIT = ";transport=" transport -protocol = " ;protocol= " aaa -protocol transport -protocol ... whether the message is proxiable or not; CHAPTER AAA ON THE INTERNET 220 • whether the message contains a protocol error according to the format of a Diameter message; • whether the message is ... THE DIAMETER PROTOCOL 6.3 217 The Diameter Protocol Diameter is specified as a base protocol and a set of Diameter applications that complement the base protocol functionality The base protocol contains...

Ngày tải lên: 01/08/2014, 17:21

... transport -protocol agnostic and, thus, can run over reliable transport protocols, such as TCP (Transport Control Protocol) , and over unreliable transport protocols, such as UDP (User Datagram Protocol) ... application-layer acknowledgement message that confirms the reception of the original message by the other end When unreliable transport protocols are used, messages are retransmitted at the application ... of the messages However, sometimes SIP message bodies are just too large, even after compression 92 CHAPTER SESSION CONTROL ON THE INTERNET Figure 4.42: SigComp extended operations Large messages...

Ngày tải lên: 01/08/2014, 17:21

... controller The master controller, set for setpoint response, is usually a PI or PID controller 108 JUMO, FAS 525, Edition 02.04 Improved control quality through special controls For cascade control, ... this controller is designated as master controller, whilst the subordinate controller controls the substance mixing ratio to meet the requirements of the master controller Fig 73: Ratio control ... Improved control quality through special controls a) Maintaining the disturbance constant z Auxiliary controller w x Controller y Process b) Additive switched disturbance correction z w x Controller...

Ngày tải lên: 07/08/2014, 15:20

... of multi -control systems at the expense of additional developments (see [DOR 95, FRI 86]) 188 Analysis and Control of Linear Systems Figure 6.10 Control by the observer, compared to control by ... there is a control for which J (whose upper bound is infinite) acquires a finite value: since the non-controllable part is stable, any state feedback placing all the poles of the controllable ... ) ⎩ [6.69] Figure 6.8 Control by state feedback and observer The name LQG (that stands for Linear-Quadratic-Gaussian) control is sometimes used to designate this type of control It obviously refers...

Ngày tải lên: 09/08/2014, 06:23

... Advanced control engineering Controller Plant K1 s(s + 2s + 4) R(s) + C(s) – Fig 6.20 Closed-loop control system Example 6.4 (See also Appendix 1, examp64.m) Construct the Nyquist diagram for the control ... 6.5 For the control system given in Example 6.4, determine (a) The controller gain K1 to give the best flatband response What is the bandwidth, gain margin and phase margin? (b) The controller ... 1/(1 ‡ Kp ) acceptably small Most control systems are type one, the integrator either occurring naturally, or deliberately included in the form of integral control action, i.e PI or PID Stability...

Ngày tải lên: 09/08/2014, 06:23

... integrate with genetic control The development of commercially based genetic control, which provides a product that competes successfully on the open market with conventional control will have to ... Mutations for the Control of Insect Populations, in Sterility Principle for Insect Control or Eradication IAEA, 1971 © 2000 by CRC Press LLC Smith, R.H and R.C von Borstel Genetic Control of Insect ... Insect Control by Genetic Manipulation of Natural Populations Science 172, 682–684, 1971a Whitten, M.J Use of Chromosome Rearrangements for Mosquito Control Sterility Principle for Insect Control...

Ngày tải lên: 11/08/2014, 04:20

... Particulate Matter (Includes PM2.5) 6.5 THE “COMPLETE” ENVIRONMENTAL SURVEILLANCE AND CONTROL SYSTEM An ideal surveillance and control system can be devised employing continuous monitoring, telemetering, ... amplifier /control section for amplification and phase inversion, then back into the analyzer section for synchronous rectification The resulting fullwave-rectified signal is returned to the amplifier /control ... ambient air quality and optimizing models Figure 6.1 illustrates one conception of a surveillance and control system This system would demand instruments which could be calibrated to a known standard,...

Ngày tải lên: 11/08/2014, 06:22