ACA Aruba Associate Routing & IP Services 1 — Questions and Answers
Question 1: What is the key difference between static routing and dynamic routing?
- Static routing uses encryption; dynamic routing does not
- Static routes are manually configured; dynamic routes are learned automatically via routing protocols (Correct answer)
- Static routing only works with IPv6; dynamic routing works with IPv4
- Static routing requires a dedicated router; dynamic routing works on switches
Correct answer: Static routes are manually configured; dynamic routes are learned automatically via routing protocols
Static routes are manually entered by an administrator and do not adapt to topology changes, while dynamic routing protocols automatically discover and update routes based on network changes.
Question 2: Which dynamic routing protocol is commonly used within an enterprise campus network and is classified as a link-state protocol?
- RIP
- OSPF (Correct answer)
- BGP
- EIGRP
Correct answer: OSPF
OSPF (Open Shortest Path First) is a link-state routing protocol widely used within enterprise networks, building a complete topology map and computing shortest paths using Dijkstra's algorithm.
Question 3: What does the subnet mask /24 indicate about an IP network?
- The network has 24 hosts available
- The first 24 bits are the network portion, leaving 8 bits for hosts (254 usable hosts) (Correct answer)
- The maximum transmission unit is 24 bytes
- The network supports 24 VLANs
Correct answer: The first 24 bits are the network portion, leaving 8 bits for hosts (254 usable hosts)
A /24 prefix length means the first 24 bits identify the network, leaving 8 bits for host addresses, yielding 256 addresses with 254 usable host addresses.
Question 4: What is the purpose of DHCP in an IP network?
- To resolve domain names to IP addresses
- To automatically assign IP addresses and network parameters to client devices (Correct answer)
- To route packets between different IP networks
- To encrypt traffic between client and server
Correct answer: To automatically assign IP addresses and network parameters to client devices
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to client devices on a network.
Question 5: Which DHCP message does a client send to discover available DHCP servers on the network?
- DHCP Offer
- DHCP Request
- DHCP Discover (Correct answer)
- DHCP Acknowledge
Correct answer: DHCP Discover
A DHCP Discover message is broadcast by a client to locate available DHCP servers; it is the first step in the DORA (Discover, Offer, Request, Acknowledge) process.
Question 6: What is a DHCP relay agent used for?
- To encrypt DHCP traffic between clients and servers
- To forward DHCP broadcasts across routed network boundaries to a centralized DHCP server (Correct answer)
- To cache DHCP leases locally on each switch
- To assign static IP addresses from a preconfigured list
Correct answer: To forward DHCP broadcasts across routed network boundaries to a centralized DHCP server
A DHCP relay agent (IP helper) forwards DHCP broadcast messages across Layer 3 boundaries, allowing a centralized DHCP server to serve clients on multiple subnets.
ACA Aruba Associate Routing & IP Services 1
What is the key difference between static routing and dynamic routing?