Showing posts with label entry. Show all posts
Showing posts with label entry. Show all posts

Tuesday, 16 February 2016

How to Change the DNS on Yahoo HostingIn Feburary 2016 16,

In Feburary 2016 16,
Browse to the Yahoo Business Control Panel (link in Resources) and sign in with your Yahoo username and password.
Click on “Manage My Services,” then on “Domain Control Panel.” If you have more than one domain associated with your Yahoo account, you will see separate Domain Control Panel options for each entry.
Click on “Manage Advanced DNS Settings,” then on “Change Name Servers” to bring up the DNS control panel.
Delete the existing entries in the primary and secondary server name fields, and add the host names of the servers you want to use. Click “Submit” to save your changes.
In Feburary 2016 16,

Friday, 5 February 2016

How Is a Router's Routing Table Updated?In Feburary 2016 05,

In Feburary 2016 05,
A routing table is a collection of information on where a network is located in reference to the router the table is in. Routers can have one or many ports, and each port can access many different networks. The routing table specifies on which port a packet is sent out based on the address the packet is for. All routing tables contain at least one entry known as the default gateway. The default gateway is where packets are sent if they are addressed to a network that the table has no route for.As an example, let's say you have a router with the following entries in the routing table: network 192.168.1.0 is reached via port 1, network 192.168.2.0 is reached via port 2, network 192.168.3.0 is reached via port 3, and port 4 is the default gateway. If a packet is addressed to 192.168.3.1, the router checks the routing table to see what port network 192.168.3.0 is reached through. Since that network is reached through port 3, the packet is then sent out via port 3. A packet destined for network 192.168.10.0 would leave via port 4 because port 4 is the default gateway, and there is no known route for that network address. It is important to note that the receiving network does not have to be connected directly to a port, only that it is reached by that port. This would occur if there was another router in the line that was directly connected to the receiving network.
Dynamic vs. Static Tables
Routing tables updates depend on how the table is made. If the routing table is static, then updates must be done manually by a network administrator. This is one of the reason why static tables are not popular. If the table is dynamic, then changes will be made automatically. Dynamic routing tables can be changed manually, and the first entries are often added by the network administrator to allow for quicker routing from the start.
Updating Dynamic Tables
For every packet sent across the network, a reply packet is sent back. When the router with a dynamic routing table receives a return packet, it examines the header information to see the route that was taken. It will then use that information to update its router table if it can. If the packet returns on the default gateway, no updates are made, as all packets for the receiving network were already routed through that port from the beginning. In the previous example, if the packet that was sent out via port 4 for network 192.168.10.0 returned via port 2, the routing table would update to show that both networks 192.168.2.0 and 192.168.10.0 are reached via port 2. The next packet sent to network 192.168.10.0 would then leave via port 2 instead of the default gateway.
In Feburary 2016 05,