... 3. 3.2 The Domain Name System (DNS) 3.3 .3 Dynamic Domain Name System (DDNS) 3. 3.4 DNS Security 3. 3.5 Does The Network ... 3. 3.6 Domain Administration 3. 3.7 A Few Words on Creating Subdomains 3. 3.8 A Note on Naming Infrastructure 3. 3.9 Registering ... Cabling type Coaxial Coaxial UTP Maximum cable length 500m 185m 100m Topology limitation 5-4 -3 rule 5-4 -3 rule 5-4 -3 rule Maximum number of workstations on a single segment 100 30 (requires the...
... static route Gateway of last resort is not set 34 .0.0.0/16 is subnetted, subnets O 34 .1.0.0 [110/65] via 54 .34 . 23. 12, 00:00:51, Serial0 54.0.0.0/24 is subnetted, subnets C 54 .34 . 23. 0 is directly connected, ... B − BGP D − EIGRP, EX − EIGRP external, O − OSPF, IA − OSPF inter area N1 − OSPF NSSA external type 1, N2 − OSPF NSSA external type E1 − OSPF external type 1, E2 − OSPF external type 2, E − EGP ... the second octet of a Class A IP address provides the subnet number In our example, address 34 .1.0.0 refers to network 34 , subnet 1; address 34 .2.0.0 refers to network 34 , subnet 2, and so on...
... static route Gateway of last resort is not set 34 .0.0.0/16 is subnetted, subnets O 34 .1.0.0 [110/65] via 54 .34 . 23. 12, 00:00:51, Serial0 54.0.0.0/24 is subnetted, subnets C 54 .34 . 23. 0 is directly connected, ... B − BGP D − EIGRP, EX − EIGRP external, O − OSPF, IA − OSPF inter area N1 − OSPF NSSA external type 1, N2 − OSPF NSSA external type E1 − OSPF external type 1, E2 − OSPF external type 2, E − EGP ... the second octet of a Class A IP address provides the subnet number In our example, address 34 .1.0.0 refers to network 34 , subnet 1; address 34 .2.0.0 refers to network 34 , subnet 2, and so on...
... static route Gateway of last resort is not set 34 .0.0.0/16 is subnetted, subnets O 34 .1.0.0 [110/65] via 54 .34 . 23. 12, 00:00:51, Serial0 54.0.0.0/24 is subnetted, subnets C 54 .34 . 23. 0 is directly connected, ... B − BGP D − EIGRP, EX − EIGRP external, O − OSPF, IA − OSPF inter area N1 − OSPF NSSA external type 1, N2 − OSPF NSSA external type E1 − OSPF external type 1, E2 − OSPF external type 2, E − EGP ... the second octet of a Class A IP address provides the subnet number In our example, address 34 .1.0.0 refers to network 34 , subnet 1; address 34 .2.0.0 refers to network 34 , subnet 2, and so on...
... 10001 - = 192 .32 .1 43. 0 (Class C address) 255.255.248.0 (network mask) logical_AND 192 .32 . 136 (same IP prefix) Figure 3- 15 Classless Inter-Domain Routing: IP supernetting example This process ... elective See Figure 3- 33 and Figure 3- 34 on page 114 for details number 16 entry length 31 TTL router address preference level // // router address n preference level n Figure 3- 33 ICMP: Router Advertisement ... these rules is 194 .32 . 136 through 194 .32 .1 43, in which case the range consists of all of the IP addresses with the 21-bit prefix 194 .32 . 136 , or B '110000100010000010001' The maximum number of network...
... Vector Table Next Hop Metric Net Next Hop Metric Net Next Hop Metric N1 R1 N1 R2 N1 R3 N2 Direct N2 R2 N2 R3 N3 Direct N3 Direct N3 R3 N4 R3 N4 Direct N4 Direct N5 R3 N5 R4 N5 Direct N6 R3 N6 R4 N6 ... Like OSPF, the frequency used to exchange packets is based on the network type Packets are exchanged at a five second interval on high bandwidth links (for example, LAN segments) Otherwise, hello ... to specify the next hop is shown in Figure 5-12 Number of Octets 16 IPv6 Next Hop Address Reserved Reserved { Metric 0x' FF' Used to distinguish a next hop entry Figure 5-12 Next Hop route table...
... Table 8-1) Table 8-1 DSCP pools Pool Codepoint space Assignment xxxxx0 Standard action xxxx11 Experimental/local use xxxx01 Future experimental /local use Differentiated Services domains The setup ... control over their delay It is important to understand that the delay in an IP network has two parts: a fixed transmission delay and a variable queuing delay The fixed delay depends on the chosen ... and maximal datagram delays), but it controls the maximum queuing delay The Guaranteed Service model represents the extreme end of delay control for networks Other service models providing delay...
... 20 03) RFC 34 84 – Default Address Selection for Internet Protocol version (IPv6) (February 20 03) RFC 35 96 – DNS Extensions to Support IP Version (October 20 03) (Obsoletes RFC3152, RFC1886) RFC 36 33 ... from a subagent 11.2.4 REXX sockets The Restructured Extended Executor (REXX) programming language was originally developed by IBM in 1982, but since then a wide variety of platforms have created ... for their platforms In order to enable REXX applications to communicate over the TCP/IP network, most platforms have created a REXX socket API to allow: Socket initialization Data exchange through...
... is, a X' 0D0A' sequence on a text file) can be represented by =XX, where XX are two uppercase hexadecimal digits If none of the other rules apply, the character must be represented as XX Any ... range X' 21' to X' 7E', except for X' 3D' (=), can be represented as the ASCII character ASCII tab (X' 09') and space (X' 20') can be represented as the ASCII character, except when it is the last ... Base64 value ASCII char Base64 value ASCII char A 16 Q 32 g 48 w B 17 R 33 h 49 x C 18 S 34 i 50 y D 19 T 35 j 51 z E 20 U 36 k 52 F 21 V 37 l 53 Chapter 15 Mail applications 585 Base64 value ASCII...
... classes Table 18 -3 WTP facilities and transaction classes WSP facility WTP transaction classes Session Management Class and Class Method Invocation Class Session Resume Class and Class Push Class ... presentity's name or even an MP3 Chapter 19 Presence over IP 715 19 .3 Presence protocols The Extensible Messaging and Presence Protocol (XMPP) is an open Extensible Markup Language (XML) protocol for near-real-time ... Presence (August 2004) RFC 38 63 – Presence Information Data Format (PIDF) (August 2004) RFC 39 20 – Extensible Messaging and Presence Protocol (XMPP): Core (October 2004) RFC 39 53 – Telephone Number...
... handle, but still be able to exchange data between the networks by relaying it in the proxy server Figure 22-14 shows an FTP proxy server Security database FTP Proxy FTP proxy rules port 20/21 TCP/UDP ... 22 -3, where Alice sends an encrypted message to Bob Bob's public key cleartext clea cle Bob's private key Encryption Cleartext cleartext clea cle cleartext clea cle Decryption Original cleartext ... private key cleartext clea cle Alices's public key cleartext clea cle Encryption Cleartext Ciphertext cleartext clea cle Decryption & authentication Alice Original cleartext Bob Figure 22-4 Authentication...
... Số mạng dùng Số máy mạng A 1126 w x. y.z 126 16,777,214 B 128191 w .x y.z 16 ,38 4 65, 534 C 1922 23 w .x. y z 2,097,152 254 Cỏch ỏnh a ch mng network ID -Network ID x c nh cỏc mỏy s dng TCP/IP trờn cựng ... a ch trm (octet th 3) cho a ch mng mi network ID Khi a ch 139 .12.0.0 c ch nh nh hỡnh trang bờn, chia mng thnh cỏc mng khỏc cú a ch network ID ( 139 .12.1.0, 139 .12.2.0, 139 .12 .3. 0) c to Router nhn ... cuối A w.0.0.1 w.255.255.254 B w .x. 0.1 w .x. 255.254 C w .x. y.1 w .x. y.254 Subnets v Subnet Masks -Phõn lp a ch Internet c thit k cung cp ba di IP khỏc kt ni mng, ú 32 bit ca a ch IP c chia thnh network...
... triệu host / mạng Lớp A đợc dùng cho mạng có số trạm cực lớn - Lớp B: định danh 1 638 4 mạng với tốiđa 65 534 host / mạng - Lớp C: định danh triệu mạng với tốiđa 254 trạm / mạng đợc dùng cho mạng trạm ... xuất Các mạng dùng riêng nối với Internet thờng bị đe dọa kẻ công Để bảo vệ liệu bên phảicó cách phép ngời dùng hợp lệ qua chặn lại ngời dùng bất hợp lệ Các máy chủ Web FTP nơi đợc kết nối vào ... thể hệ Có số mặt cần lu ý chiến lợc an toàn hệ thống là: a Quyền hạntối thiểu (Last Privilege) Theo chiến lợc đối tợng có quyền hạn định thông tin tài nguyên mạng Đây chiến lợc tảng b Bảo vệ...
... Networks Class B bị người ta x hết Trong số công ty có Microsoft Exxon Sau Class C Networks bắt đầu với Octet thứcó values range 192 đến 2 23 dùng Octets để biểu diễn NetworkID Như ta cókho ng triệu ... Columbia Các Networks thu c Class B bắt đầu với Octet thứcó values range 128 đến 191 Trong Class B ta dùng Octets đầu cho NetwordID Do ta có 16 ,38 4 Class B Networks, Network có 65, 534 (2 lũy ... lại bảođảm việc giao hàng (messages) vừa dùng x c nhận hàng đến (Acknowledgement ) giống thưbảo đảm, vừa kiểm xem kiện hàngcó bị hư hại không cách dùng CRC (Cyclic Redundant Check) , giống có...