A router forwards traffic based on a FIB table.

Comprehensive and Detailed In-Depth Explanation:

The Flag field in a routing table entry provides specific information about the route.

G (Gateway flag) : This flag indicates that the next hop is a gateway (another router) rather than a directly connected destination.

S (Static flag) : This flag indicates that the route was manually configured as a static route .

H (Host flag) : This flag means that the destination is a directly connected host , not a network.

D (Dynamic flag) : This flag is used for dynamically learned routes from protocols like OSPF, EIGRP, or BGP.

Since we are looking for the flag that indicates the next hop is a gateway , the correct answer is G .

???? Reference: Huawei HCIA-Datacom Study Guide, Chapter on Routing Table and FIB Entries.