Packet Forwarding JN0-105 Practice Questions (Page 5)

Questions 21–24

1. 21application · medium

   A Junos router has a static route to 198.51.100.0/24 with next hop 192.0.2.1. The interface to 192.0.2.1 goes down. What happens to the static route?

   • AThe route remains in the forwarding table but is marked as 'unreachable'.
   • BThe route is automatically replaced with a route from another protocol.
   • CThe route remains active and traffic is black-holed.
   • DThe route becomes inactive and is removed from the forwarding table.
   Reveal Solution Discussion Select an answer first
2. 22expert · medium

   A Junos router has a route to 192.0.2.0/24 with next hop 198.51.100.1. The interface to 198.51.100.1 is up, but the ARP entry for 198.51.100.1 is missing. What will the router do when forwarding a packet to 192.0.2.1?

   • AIt will drop the packet because the next hop is not in the ARP table.
   • BIt will forward the packet to the default gateway instead.
   • CIt will send an ARP request to resolve the next-hop MAC address.
   • DIt will use the MAC address of the outgoing interface.
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4. 23foundation · easy

   Which table in Junos contains the active routes that are actually used to forward packets?

   • ARouting table
   • BARP table
   • CInterface table
   • DForwarding table
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5. 24application · medium

   A Junos router receives a packet destined for 203.0.113.55. The routing table contains a route to 203.0.113.0/24 with next hop 192.0.2.1. How does the router determine the next hop for this packet?

   • AIt sends the packet to the Routing Engine for a route lookup and forwarding decision.
   • BIt uses the default route's next hop if one exists, regardless of more specific routes.
   • CIt uses the next hop of the first route in the routing table that matches the destination.
   • DIt performs a longest-prefix-match lookup in the routing table and uses the associated next hop.
   Reveal Solution Discussion Select an answer first