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The Illustrated Network- P74 potx

The Illustrated Network- P74 potx

The Illustrated Network- P74 potx

... is one of the most secure fi rewall types that can be deployed. The proxy sits between the protected network and the rest of the world. Every packet sent outbound is intercepted by the proxy, ... other fi rewall fi lters, are also applied to an interface in the outbound or inbound direction (or both). However, the traffi c on the interface must be sent to the AS PIC in order to apply the ... rewall fi lter rules. The AS PIC’s sp- interface must be given an IP address, just as any other interface on the router. Traffi c then makes its way to the AS PIC by using the AS PIC’s IP address...
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The Illustrated Network- P7 potx

The Illustrated Network- P7 potx

... of, the physical address used by the frames that carry the packets between adjacent systems.Why should the systems need two addresses for the two layers? Why can’t they just both use either the ... 3, which forwards the data, is the destination reachable.)These forwarding decisions are made at the TCP/IP network layer. The Network Layer The network layer delivers data in the form of a packet ... where the packet came from (so the sender can reply)? The key concept at the network layer is the network address, which provides this information. In TCP/IP, the network address is the IP...
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The Illustrated Network- P20 potx

The Illustrated Network- P20 potx

... point-to-point links), they came up with the term “datagram.” The IP layer of the whole TCP/IP protocol stack is the very heart of TCP/IP. The frames that are sent and delivered across the network from ... learn about the IP layer. We’ll start with the fi elds in the IPv4 and IPv6 packet headers. We’ll discuss most of the fi elds in detail and show how many of them relate to each other.You will ... received by the sender, the content is used to update the IPv6 Neighbor cache (the equivalent of the IPv4 ARP cache).More details on ND message formats and operation are discussed in the ICMP...
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The Illustrated Network- P31 potx

The Illustrated Network- P31 potx

... numbers every time they are run. The server has no trouble replying to the proper client because the server can just reverse the source and destination port numbers to send a reply to the correct ... don’t want to add these to the application? Files cannot use quick request–response messages to transfer themselves over a network. That’s the job of TCP, which is the topic of the next chapter.CHAPTER ... innovate. Of course, if another vendor chooses the same port number for a server process, and they are run on the same system, there would be no way to distinguish between these two seemingly identical...
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The Illustrated Network- P36 potx

The Illustrated Network- P36 potx

... rulesϭGig EthernetNote: All links use 10.0.x.yaddressing only the lasttwo octets are shown.FIGURE 13.1 The hosts on the LANs have routing tables as well as the routers. The ISPs on the Illustrated ... on the hosts on the LANs, as shown in Figure 13.1. But we’ll also discuss, for the fi rst time, how the two ISPs on the network (called Ace ISP and Best ISP) relate to each other and how their ... what they do. We’ll investigate the differences between interior and exterior routing protocols as the terms apply to an ISP. We’ll also talk about routing policies and the role they play on the...
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The Illustrated Network- P38 potx

The Illustrated Network- P38 potx

... such as the IXPs.This is one reason that Ace ISP and Best ISP in Figure 13.1 at the beginning of the chapter maintain multiple links between the four routers in the “quad” between their border ... collection of other ISPs just like Ace and Best.Can LAN1 reach LAN2 through the Internet”? Maybe. It all depends on the arrange-ments between our two ISPs and the ISPs at the end of the “Internet” ... each other, or ISP A or ISP C is willing to become a customer of ISP B, there will be no routing information sent to ISP A or ISP C to allow these ISPs to reach each other through ISP B. The...
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The Illustrated Network- P46 potx

The Illustrated Network- P46 potx

... fxp0.0 disable; The local keyword means that the local router is the RP. The address is the RP address that will be used in PIM messages between the routers. The confi guration on the non-RP router, ... So, the source’s router (actually, the DR) encapsulates the multicast packets inside a unicast packet sent to the RP and tunnels the packet to the RP in this form. The RP decapsulates the multicast ... disable; The static keyword means that another router is the RP, located at the IP address given. The RP address is used in PIM messages between the routers.Once PIM is up and running on the rest...
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The Illustrated Network- P47 potx

The Illustrated Network- P47 potx

... into one stream and carrying them all over the total bandwidth on the same “unchannelized” fi ber optic link. If there are voice, video, and data channels on the link, these are now virtual channels ... and terminate in the same equipment—not only at the physical layer, but at some layer above the lowest.On modern Metro Ethernet links, the convergence is done by combining the traffi c from ... PIM dense mode?4. Will the leftmost router with the uninterested host constantly stream multicast traffi c onto the LAN anyway?5. Is the uninterested host on the LAN in the middle able to listen...
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The Illustrated Network- P63 potx

The Illustrated Network- P63 potx

... the messages (the more text avail-able, the better) or by simply fi nding out the “secret” key (the basis of many old spy movies). The key is the weakest point of the system: You can’t use the ... is the point. The page and lock are shown in Figure 23.5. IE7 moves the lock to the top of the page, but it’s the same lock.We can always view the certifi cate again by double-clicking on the ... “problem.” The certifi cate could have expired, or the name on the certifi cate might not match the Web site. The user can choose to proceed, or not, or view the certifi cate itself.Servers use the...
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The Illustrated Network- P1 docx

The Illustrated Network- P1 docx

... and Interfaces 27 Encapsulation 28 The Layers of TCP/IP 30 The Physical Layer 30 The Data Link Layer 32 The Network Layer 35 The Transport Layer 38 The Application Layer 41 Session Support ... xxiiiAbout the Author xxxPART I Networking BasicsCHAPTER 1 Protocols and Layers 3 The Illustrated Network 7 Remote Access to Network Devices 8 File Transfer to a Router 10 CLI and GUI 11 Ethereal ... in the United States08 09 10 11 12 10 9 8 7 6 5 4 3 2 1CHAPTER 2 TCP/IP Protocols and Devices 47 Protocol Stacks on the Illustrated Network 50 Layers, Protocols, Ports, and Sockets 51 The...
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