An IT Geek
A wildcard mask is a sequence of numbers that streamlines packet routing within the subnets of a proprietary network. A subnet can be a geographically defined local area network (LAN). Alternatively, a subnet may define security boundaries, departmental boundaries, multicast zones or hardware security parameters. The use of a mask saves a router the task of having to handle an entire IP address because the router deals only with the digits selected by the mask. Wildcard masks are commonly used with Open Shortest Path First (OSPF) router protocols and in access control lists for Cisco routers.
Once a packet has arrived at an organization's main gateway with its network number, that packet is routed to its ultimate destination using a subnet number. The wildcard mask is usually a string of binary digits shown over the subnet number, telling the router which parts of the subnet number to look at. A binary "0" over a particular digit in the subnet number says "Pay attention to this digit." A "1" says "Ignore this digit." In a wildcard mask, all the binary "0"s in a conventional subnet mask are replaced by "1"s and all the "1"s are replaced by "0"s.
- How can you guarantee a job for students who has no experience in Networking field?
- How to configure VPN between Cisco Router and ASA Firewall?
- How to configure RIPV2 with no auto summary?
- How to configure PAT (Port Address Translation)?
- How to configure Default Routing on Cisco Routers?
- What is the scope of CCNA course in India?
- What is scope of CCIE?
- How to remember 7 layers of OSI Model?
- How much salary can we get after doing CCNA course in Delhi Gurgaon?
- How many CCIE’s are there worldwide?
- Is it possible to pass CCIE Certification in 1st attempt?