200-901 Network Fundamentals Practice Test 4 — 15 Questions

Question 1

In HTTP/2, which feature allows multiple concurrent requests and responses to be interleaved on a single connection, improving performance?

Accepted Answer

Multiplexing. HTTP/2 multiplexing allows multiple streams to be sent concurrently over a single TCP connection, reducing head-of-line blocking.

Answer

Header compression (HPACK)

Answer

Server push

Answer

Binary framing

Question 2

Which of the following is a private IPv4 address range as defined by RFC 1918?

Accepted Answer

10.0.0.0/8. The private IPv4 ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. 169.254.0.0/16 is link-local (APIPA).

Answer

192.167.0.0/16

Answer

169.254.0.0/16

Answer

172.32.0.0/12

Question 3

An application needs to discover the MAC address of another device on the same local network. Which protocol does it use?

Accepted Answer

ARP. ARP (Address Resolution Protocol) is used to map an IP address to a MAC address on a local network.

Answer

DNS

Answer

ICMP

Answer

DHCP

Question 4

In Software-Defined Networking (SDN), which interface is used for communication between the controller and the network devices (e.g., switches) to forward traffic?

Accepted Answer

Southbound API. The southbound API (e.g., OpenFlow, NETCONF) is used to communicate between the SDN controller and the data plane devices.

Answer

Northbound API

Answer

Control plane

Answer

East-West API

Question 5

Which TWO of the following are characteristics of TLS (Transport Layer Security) used in HTTPS? (Choose two.)

Accepted Answer

It uses asymmetric encryption to exchange a symmetric session key.. Option B is correct because the TLS handshake uses asymmetric cryptography (e.g., RSA key transport or ECDHE for key agreement) to securely establish a shared symmetric session key, which is then used for bulk data encryption with algorithms like AES-GCM. Option E is correct because TLS authenticates the server via an X.509 certificate signed by a trusted CA, and can optionally authenticate the client through client certificates during mutual TLS. Option A is incorrect because stream multiplexing is a feature of HTTP/2 and QUIC, not TLS itself. Option C is incorrect because TLS is a session/presentation-layer security protocol that runs between TCP and application protocols like HTTP, not an application-layer protocol. Option D is incorrect because port 443 is the default port for HTTPS, not an inherent characteristic of TLS, which can run over any port.

Answer

It supports multiplexing of multiple streams.

Answer

It is an application layer protocol like HTTP.

Answer

It uses port 443 by default.

Question 6

Which THREE of the following are benefits of using an SDN (Software-Defined Networking) architecture compared to traditional networking? (Choose three.)

Accepted Answer

Automation of network configuration changes.. Option B is correct because SDN's centralized controller exposes northbound APIs (e.g., REST) that let orchestration tools push configuration programmatically, enabling automation of network configuration changes instead of manual CLI work on each device. Option C is correct because that same programmable control plane allows new services and policies to be provisioned in software via the controller rather than waiting on per-device hardware configuration, so new network services deploy faster. Option D is correct because SDN logically centralizes the control plane in a controller, giving a single, network-wide view and centralized control and visibility over all data-plane devices. Option A is not a benefit—SDN changes the skill set required but does not inherently reduce the need for network engineers. Option E is not a benefit—SDN does not provide built-in encryption for all traffic; encryption is handled by separate mechanisms such as IPsec, TLS, or MACsec.

Answer

Reduced need for network engineers.

Answer

Built-in encryption for all network traffic.

Question 7

Which TWO of the following protocols use UDP as the transport layer protocol? (Choose two.)

Accepted Answer

DNS. DNS (A) is correct because standard DNS queries and responses use UDP on port 53, since the small request/response exchange benefits from UDP's low overhead and the application handles retransmission itself. DHCP (C) is correct because DHCP operates over UDP, using ports 67 (server) and 68 (client) for its broadcast-based DORA (Discover, Offer, Request, Acknowledge) message exchange. HTTP (B) is not correct because HTTP uses TCP, typically on port 80 or 443, to guarantee ordered and reliable delivery of web content. SMTP (D) is not correct because SMTP uses TCP on port 25 (or 587/465) to reliably transfer mail between servers. SSH (E) is not correct because SSH uses TCP on port 22 to provide a reliable, encrypted interactive session.

Answer

HTTP

Answer

SMTP

Answer

SSH

Question 8

A network engineer is troubleshooting connectivity issues and wants to verify the path that packets take from a source to a destination IP address. Which OSI layer is primarily responsible for packet forwarding and routing?

Accepted Answer

Layer 3 - Network. The Network layer (Layer 3) is responsible for packet forwarding and routing, using logical IP addresses to determine the best path from source to destination. Protocols like IP (IPv4/IPv6) and routing protocols (e.g., OSPF, BGP) operate at this layer to make forwarding decisions. The traceroute command is a common tool that leverages Layer 3 TTL (Time-to-Live) fields to map the path packets take.

Answer

Layer 4 - Transport

Answer

Layer 1 - Physical

Answer

Layer 2 - Data Link

Question 9

An application requires reliable, ordered delivery of data with flow control and retransmission of lost segments. Which transport layer protocol should the developer choose and what is a key characteristic of this protocol?

Accepted Answer

TCP; it uses a three-way handshake for connection establishment. TCP is the correct transport protocol because it provides reliable, ordered delivery with flow control and retransmission of lost segments, and a defining characteristic is that it establishes connections via the three-way handshake (SYN, SYN-ACK, ACK). UDP provides none of these guarantees, and TCP actually has higher overhead than UDP, not lower.

Answer

UDP; it provides ordered delivery through sequence numbers

Answer

TCP; it has lower overhead than UDP

Answer

UDP; it uses a three-way handshake for connection establishment

Question 10

A network administrator is configuring subnetting for a new branch office that requires 50 usable host addresses per subnet. The available network is 192.168.10.0/24. What subnet mask should be used to meet the requirement with minimal waste?

Accepted Answer

255.255.255.192 (/26). A /26 mask provides 62 usable hosts (2^(32-26)-2=62), which is the smallest subnet that supports 50 hosts.

Answer

255.255.255.128 (/25)

Answer

255.255.255.224 (/27)

Answer

255.255.255.240 (/28)

Question 11

A developer is designing a microservices architecture where services need to discover each other using DNS. The team wants to map a service name 'payment-service.example.com' to its IPv6 address. Which DNS record type should be used?

Accepted Answer

AAAA record. The AAAA record (Quad-A) is the correct DNS record type for mapping a hostname to an IPv6 address, as defined in RFC 3596. Since the requirement is specifically to resolve 'payment-service.example.com' to an IPv6 address, the AAAA record is the appropriate choice.

Answer

PTR record

Answer

A record

Answer

CNAME record

Question 12

A web application uses HTTPS to secure communications between client and server. What does HTTPS add on top of HTTP to provide encryption and authentication?

Accepted Answer

SSL/TLS. HTTPS is HTTP layered over SSL/TLS, which provides encryption (confidentiality), integrity, and server authentication via X.509 certificates. TLS negotiates a session key using asymmetric cryptography, then encrypts the HTTP payload with symmetric ciphers. This is what distinguishes HTTPS from plain HTTP.

Answer

SSH

Answer

IPsec

Answer

VPN

Question 13

A network engineer is configuring a wireless network for a new office. To maximize performance and minimize interference, the engineer decides to use the 5 GHz band. Which of the following is a key advantage of 5 GHz over 2.4 GHz?

Accepted Answer

Less interference and more channels. 5 GHz offers more non-overlapping channels and less interference from common devices like microwaves and Bluetooth.

Answer

Better range through walls

Answer

Larger coverage area

Answer

Higher compatibility with older devices

Question 14

In Software-Defined Networking (SDN), the control plane is separated from the data plane. Which of the following best describes the function of the southbound API?

Accepted Answer

Interface between the controller and network devices. Southbound API is used by the SDN controller to communicate with network devices (e.g., switches, routers) to enforce forwarding rules.

Answer

Interface between applications and the controller

Answer

Communication between two controllers

Answer

Interface between the control plane and management plane

Question 15

A developer is troubleshooting an HTTP API call that returns a 404 status code. Which of the following is the most likely cause?

Accepted Answer

The requested URL endpoint does not exist. HTTP 404 Not Found is a client-side error indicating the server could not find the requested resource at the specified URL. The most likely cause is that the endpoint path is incorrect, misspelled, removed, or not mapped to any route on the server. The server itself is reachable and processed the request, but no matching resource exists, which is precisely what 404 signifies.

Answer

The server is unavailable due to maintenance

Answer

The server encountered an internal error

Answer

The client lacks proper authentication