By Rob Cameron
The writer did an excellent activity making this typically dry fabric effortless to understand.
I guess he is sturdy taking a look too.
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Extra resources for Configuring NetScreen Firewalls
Com. There are other parts that are set in the IP header, but are not germane to this discussion. The routing table is referenced and then the operating system determines which path to send this packet to. In routing, each system that receives the packet determines the next location or hop to send the packet to. So when sending information or requests across the Internet, there may be 15 hops or routers to go through before you get to the final system you are trying to connect to. Simply stated, a router is a system whose primary function is to route traffic from one location to another.
It is used to test if a host is responsive from a network perspective. The destination system then would receive the packet and recognize that the IP packet is echo or echo request packet. This is an echo reply packet, acknowledging the original request. Devices use ICMP for other reasons as well. That router would send a type three code zero or code one message specifying that the network or host is not available. This makes the ICMP protocol very helpful for notifying users when there is a problem with getting IP packets from one location to another.
The router forwards the packet to the next and all subsequent routers until it reaches the remote system. 16. The end station receives the packet and converts it back through the layers to the application layer. 17. The remote system responds to the client system. The anatomy of IP is very straightforward. 3 you can see what exactly makes up an IP packet header. The IP portion of a packet is called the IP header. The IP header includes the source and destination IP addresses. com. There are other parts that are set in the IP header, but are not germane to this discussion.
Configuring NetScreen Firewalls by Rob Cameron