ACA Aruba Associate Routing & IP Services 2 — Questions and Answers
Question 1: What is NAT (Network Address Translation) primarily used for in enterprise networks?
- To encrypt traffic between internal and external networks
- To translate private IP addresses to public IP addresses for Internet access (Correct answer)
- To assign VLAN tags to outbound traffic
- To compress packets before sending them over the WAN
Correct answer: To translate private IP addresses to public IP addresses for Internet access
NAT translates private RFC 1918 IP addresses used internally to a public IP address for Internet communication, conserving public IPv4 address space.
Question 2: Which type of NAT maps many internal private addresses to a single public IP address using unique port numbers?
- Static NAT
- Dynamic NAT
- PAT (Port Address Translation) (Correct answer)
- Twice NAT
Correct answer: PAT (Port Address Translation)
PAT (Port Address Translation), also called NAT overload, maps multiple internal hosts to a single public IP by differentiating connections using unique TCP/UDP port numbers.
Question 3: What is the administrative distance of a directly connected route on an Aruba AOS-CX router?
- 0 (Correct answer)
- 1
- 110
- 120
Correct answer: 0
Directly connected routes have an administrative distance of 0, representing the most trusted route source since the network is physically attached to the device.
Question 4: Which command on Aruba AOS-CX displays the IPv4 routing table?
- show arp
- show ip route (Correct answer)
- show vlan
- show interface brief
Correct answer: show ip route
The 'show ip route' command on Aruba AOS-CX displays the IPv4 routing table, showing all learned and configured routes with their sources and next-hop information.
Question 5: What does DNS (Domain Name System) do in an IP network?
- Assigns IP addresses dynamically to clients
- Translates human-readable domain names to IP addresses (Correct answer)
- Encrypts web traffic using TLS certificates
- Manages routing between autonomous systems
Correct answer: Translates human-readable domain names to IP addresses
DNS resolves human-readable domain names (e.g., practicetestgeeks.com) into IP addresses that routers and switches use to forward packets to the correct destination.
Question 6: What is the purpose of the default route (0.0.0.0/0) in an IP routing table?
- To route traffic within the local subnet
- To match any destination not covered by a more specific route, typically sending it toward the Internet (Correct answer)
- To block all traffic from unknown sources
- To assign management IP addresses to network devices
Correct answer: To match any destination not covered by a more specific route, typically sending it toward the Internet
The default route (0.0.0.0/0) is a catch-all route that forwards packets to a specified next-hop when no more specific route matches, commonly used to direct traffic to an Internet gateway.
ACA Aruba Associate Routing & IP Services 2
What is NAT (Network Address Translation) primarily used for in enterprise networks?