Explain the Forwarding Logic Used by Layer 3 Capable Devices NETWORKING-FOUNDATIONS Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A network administrator is troubleshooting a connectivity issue and captures packets on a router's ingress and egress interfaces. The administrator notices that the IP header's TTL field is decremented by one between the two captures. What is the primary purpose of this decrement?

   • ATo measure the round-trip time to the destination
   • BTo prioritize time-sensitive traffic
   • CTo reduce the packet's priority as it traverses the network
   • DTo prevent packets from looping indefinitely
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A router has the following routes in its routing table: 10.0.0.0/8 via 192.168.1.1, 10.1.0.0/16 via 192.168.1.2, and a default route 0.0.0.0/0 via 192.168.1.254. A packet arrives destined for 10.1.2.3. Which next hop will the router use?

   • AThe packet is dropped because multiple routes match
   • B192.168.1.254
   • C192.168.1.1
   • D192.168.1.2
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   What is the default route in a routing table?

   • AA route that has the highest administrative distance
   • BA route that is automatically created for directly connected networks
   • CA route that is used only for multicast traffic
   • DA route that matches any destination IP address
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   A router has routes for 10.0.0.0/8 and 10.1.0.0/16. A packet arrives destined for 10.1.2.3. Which route will the router use?

   • ABoth routes, because they both match the destination
   • B10.0.0.0/8, because it is the first route in the table
   • CNeither route, because the destination is not an exact match
   • D10.1.0.0/16, because it has a longer prefix length
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   When a router needs to forward a packet to the next hop, what does it do if the next-hop MAC address is not in its ARP cache?

   • AIt uses the destination MAC address from the original packet
   • BIt sends an ARP request broadcast to find the MAC address
   • CIt drops the packet and sends an ICMP error to the source
   • DIt forwards the packet to the default gateway
   Reveal Solution Discussion Select an answer first