Routing I

is how FortiGate in NAT mode decides where to send the packets that it receives and the packets that it generates. All network devices that perform routing have a routing table. A routing table contains a series of rules. Each rule specifies the next hop, which may or may not be the final destination of the packet. Each routing hop in the routed path requires a routing table lookup to pass the packet along until it reaches the final destination. When routing packets, FortiGate will first find a matching route in its list of routes based on the packet's destination address. When performing this match, FortiGate evaluates the entire routing table to find the most specific match before selecting a route. If FortiGate finds multiple matches, it uses various route attributes to determine the best route. Proper routing configuration is important. If routes are misconfigured, packets will not reach their destination and will be lost.

For each session, FortiGate performs two routing lookups:

FortiGate writes the routing information to its session table. Subsequent packets are routed according to the session table, not the routing table. So, all packets that belong to the same session follow the same path, even after a change in the static routes. However, there is an exception to this rule: if there is a change in the routing table, FortiGate removes the route information for the session table, and then it makes additional routing table lookups to rebuild this information.

Routing information is written to the session table

Dynamic routes: Fortigate Supports (select 4)

Policy routes are in the same routing table by Fortigate, and have precedence over the regular routing table.

ISDB

Which configured routes aren‘t displayed in the routing table monitor?

Each route in the routing table has the following attributes: (Select 6)

[blank_start]0[blank_end] - directly connected [blank_start]5[blank_end] - DHCP gateway [blank_start]20[blank_end] - external BGP (EBGP) routes [blank_start]200[blank_end] - internal BGP (IBGP) routes [blank_start]110[blank_end] - OSPF routes [blank_start]120[blank_end] - RIP routes [blank_start]10[blank_end] - static routes

If multiple dynamic routes have the same distance, then metric is used to break the tie. The route with the lowest metric is chosen.

Used by static routes to dermine the best route to a destination, when the distance is the same.

Priority route attibutes does not appear on the GUI routing monitor

If multiple routes to the same destination share the same distance, metric, and priority, they are all considered the best candidate. If the routes are static, OSPF, or EGP, FortiGate load balances the traffic across all routes.

ECMP

ECMP Methods (Select 4)