CompTIA Network+ Network+ Routing Protocols and Concepts 1 — Questions and Answers
Question 1: What is the primary purpose of a default route (0.0.0.0/0) in a routing table?
- To route traffic exclusively to the internet
- To forward packets when no more specific route exists (Correct answer)
- To block all traffic from unknown networks
- To create redundant paths for critical traffic
Correct answer: To forward packets when no more specific route exists
A default route (0.0.0.0/0) forwards packets when no more specific matching route exists in the routing table, acting as a catch-all gateway of last resort.
Question 2: Which routing protocol is classified as an Exterior Gateway Protocol (EGP) used between autonomous systems on the internet?
- OSPF
- EIGRP
- BGP (Correct answer)
- RIPv2
Correct answer: BGP
BGP (Border Gateway Protocol) is the only widely used Exterior Gateway Protocol, designed to exchange routing information between different autonomous systems.
Question 3: What metric does RIP (Routing Information Protocol) use to determine the best path to a destination?
- Bandwidth
- Delay
- Hop count (Correct answer)
- Link cost
Correct answer: Hop count
RIP uses hop count as its sole metric, with a maximum of 15 hops; any route with 16 or more hops is considered unreachable.
Question 4: What is the purpose of administrative distance (AD) in IP routing?
- To count the number of hops to a destination
- To rank the trustworthiness of different routing information sources (Correct answer)
- To calculate the bandwidth available on a link
- To set priority for load balancing between equal paths
Correct answer: To rank the trustworthiness of different routing information sources
Administrative distance ranks the trustworthiness of routing sources; when multiple protocols know a route, the router installs the one with the lowest AD.
Question 5: What is the administrative distance of a directly connected network interface?
- 0 (Correct answer)
- 1
- 5
- 110
Correct answer: 0
Directly connected routes have an administrative distance of 0, making them the most trusted route source since the router is physically part of that network.
Question 6: What type of routing requires a network administrator to manually enter each route into the routing table?
- Dynamic routing
- Adaptive routing
- Static routing (Correct answer)
- Link-state routing
Correct answer: Static routing
Static routing requires manual configuration of routes by an administrator and does not adapt automatically to network topology changes.
Question 7: Which Cisco IOS command displays the current IP routing table on a router?
- show ip interface brief
- show ip route (Correct answer)
- show running-config
- show ip arp
Correct answer: show ip route
The 'show ip route' command displays the router's current routing table, including route sources, destinations, and next-hop addresses.
CompTIA Network+ Network+ Routing Protocols and Concepts 1
What is the primary purpose of a default route (0.0.0.0/0) in a routing table?