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LX0-104 · Question #68

What is true regarding a default route?

The correct answer is C. The default route is only used if there is not a more specific route to a destination host or network.. The default route serves as a catch-all mechanism, directing traffic to a specified gateway when no more specific route to the destination is found in the routing table. This ensures connectivity to networks not explicitly defined.

Networking Fundamentals

Question

What is true regarding a default route?

Options

  • AThe default route is always used first. When the default route is not available more specific routes
  • BWhen a default route is set, all other routes are disabled until the default route is deleted.
  • CThe default route is only used if there is not a more specific route to a destination host or network.
  • DWithout a default route, no network communication even in directly attached networks is possible.

How the community answered

(67 responses)
  • A
    4% (3)
  • B
    1% (1)
  • C
    93% (62)
  • D
    1% (1)

Why each option

The default route serves as a catch-all mechanism, directing traffic to a specified gateway when no more specific route to the destination is found in the routing table. This ensures connectivity to networks not explicitly defined.

AThe default route is always used first. When the default route is not available more specific routes

Routing decisions prioritize more specific routes over the default route; the default route is used last, not first.

BWhen a default route is set, all other routes are disabled until the default route is deleted.

Setting a default route does not disable other specific routes; rather, other routes take precedence.

CThe default route is only used if there is not a more specific route to a destination host or network.Correct

The default route, often represented as 0.0.0.0/0 in IPv4 or ::/0 in IPv6, acts as the last resort for routing decisions. A system's routing table is consulted from most specific to least specific, and if no matching specific route exists for a destination, the default route is then used to forward the packet.

DWithout a default route, no network communication even in directly attached networks is possible.

Network communication within directly attached networks is possible even without a default route, as these routes are typically configured directly on the interface and are inherently more specific.

Concept tested: Default routing behavior

Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ip-addressing/ipv4-routing-tables#default-route

Topics

#default route#routing#network communication

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