Routing Table Subnet Mask Component

D

The component of a routing table entry that represents the subnet mask is D) Network mask.

A routing table is a database that contains information about networks and their destinations. The routing table is used by routers to determine where to forward packets. Each entry in a routing table contains several fields, including the network address, subnet mask, and next-hop address.

The prefix is the network address portion of the routing table entry. It is typically represented in CIDR notation, which combines the network address with the number of bits used for the subnet mask. For example, a prefix of 192.168.1.0/24 indicates that the first 24 bits of the network address are used for the subnet mask, while the remaining 8 bits can be used for host addresses.

The routing protocol code is a code used to identify the routing protocol used to populate the routing table entry. Common routing protocols include OSPF, BGP, and EIGRP.

The metric is a value used by the routing protocol to determine the best path to the destination network. The metric may be based on factors such as hop count, bandwidth, delay, or reliability.

The network mask is the subnet mask associated with the network address in the routing table entry. It is used to determine the network portion of an IP address and the host portion of an IP address. The subnet mask is a 32-bit value that consists of a series of 1s followed by a series of 0s. The number of 1s in the subnet mask indicates the number of bits used for the network portion of the address. For example, a subnet mask of 255.255.255.0 indicates that the first 24 bits of the IP address are used for the network portion, while the last 8 bits are used for the host portion.

In summary, the subnet mask is the component of a routing table entry that represents the network mask. It is used to determine the network portion of an IP address and is an important part of routing and subnetting.