ACA Networking Fundamentals 4

Question 1

Which routing protocol uses the Dijkstra shortest path first (SPF) algorithm and is classified as a link-state protocol?

Accepted Answer

OSPF

Answer

OSPF (Open Shortest Path First) is a link-state routing protocol that builds a complete topology map and uses Dijkstra's SPF algorithm to compute the best paths.

Question 2

What is the primary difference between TCP and UDP at the Transport layer?

Accepted Answer

TCP provides reliable, connection-oriented delivery; UDP is connectionless and faster

Answer

TCP establishes a connection with a three-way handshake and guarantees ordered, reliable delivery, while UDP sends datagrams without connection setup or acknowledgments.

Question 3

Which well-known port number is used by HTTPS (HTTP Secure)?

Accepted Answer

443

Answer

HTTPS uses TCP port 443 to establish TLS/SSL-encrypted sessions for secure web browsing.

Question 4

What does a router use to determine the next-hop for a packet when multiple routes exist for the same destination?

Accepted Answer

Routing table with administrative distance and metric

Answer

Routers consult their routing table and select the best path based on the longest prefix match, then administrative distance, then the protocol's specific metric.

Question 5

What is the loopback address in IPv4, and what is it used for?

Accepted Answer

127.0.0.1 – used to test the local TCP/IP stack without sending traffic on the network

Answer

The IPv4 loopback address 127.0.0.1 (range 127.0.0.0/8) routes traffic back to the local host, allowing software to test network stack functionality.

(ACA) Aruba Certified Associate Certification Practice Test

(ACA) Aruba Certified Associate Certification Practice Test

ACA Networking Fundamentals 4