200-901 Practice Test 26 — 15 Questions

Question 1

Which non-overlapping channels are available in the 2.4 GHz band for Wi-Fi to minimize interference?

Accepted Answer

1, 6, 11. Channels 1, 6, and 11 are the only non-overlapping channels in 2.4 GHz.

Answer

1, 3, 5, 7, 9, 11

Answer

1, 5, 9, 13

Answer

2, 7, 12

Question 2

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 3

In the OSI model, which layer is responsible for session management, including establishing, maintaining, and terminating connections between applications?

Accepted Answer

Layer 5 (Session). The Session layer (Layer 5) manages sessions between applications. The Transport layer handles end-to-end communication.

Answer

Layer 4 (Transport)

Answer

Layer 7 (Application)

Answer

Layer 6 (Presentation)

Question 4

Which wireless security standard provides the strongest encryption and is recommended for enterprise networks as of 2023?

Accepted Answer

WPA3. WPA3 is the latest standard with stronger encryption (SAE) and is recommended for modern networks.

Answer

WEP

Answer

TKIP

Answer

WPA2

Question 5

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 6

A network application requires reliable, ordered delivery of data and uses a three-way handshake to establish a connection. Which transport protocol is being used?

Accepted Answer

TCP. TCP is a connection-oriented protocol that provides reliable, ordered delivery and uses a three-way handshake (SYN, SYN-ACK, ACK) to establish a connection.

Answer

UDP

Answer

ICMP

Answer

IP

Question 7

An application requires reliable, ordered delivery of data. Which transport protocol should be used?

Accepted Answer

TCP. TCP provides reliability, ordered delivery, and connection-oriented communication.

Answer

UDP

Answer

HTTP

Answer

IP

Question 8

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 provides reliability, ordering, flow control, and retransmission. It uses a three-way handshake to establish a connection.

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 9

Which TWO of the following are valid private IPv4 address ranges? (Select two.)

Accepted Answer

10.0.0.0/8. RFC 1918 defines 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.

Answer

172.15.0.0/12

Answer

172.32.0.0/12

Answer

169.254.0.0/16

Question 10

A DNS AAAA record is used to resolve a hostname to what type of address?

Accepted Answer

IPv6 address. AAAA records map hostnames to IPv6 addresses.

Answer

Mail exchange server

Answer

IPv4 address

Answer

Canonical name alias

Question 11

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 indicates the requested resource could not be found on the server.

Answer

The server is unavailable due to maintenance

Answer

The server encountered an internal error

Answer

The client lacks proper authentication

Question 12

A network administrator is configuring a wireless network and wants to minimize interference. In the 2.4 GHz band, which set of channels are non-overlapping?

Accepted Answer

1, 6, 11. Channels 1, 6, and 11 are the only non-overlapping channels in the 2.4 GHz band.

Answer

1, 5, 9, 13

Answer

1, 3, 5, 7, 9, 11

Answer

2, 7, 12

Question 13

A network engineer is tasked with segmenting a large broadcast domain into smaller ones using VLANs. In the OSI model, at which layer does a VLAN operate?

Accepted Answer

Layer 2 - Data Link. VLANs operate at Layer 2 (Data Link) by tagging frames with VLAN IDs to separate broadcast domains.

Answer

Layer 4 - Transport

Answer

Layer 1 - Physical

Answer

Layer 3 - Network

Question 14

A developer is designing a system that requires high reliability and ordered data delivery. The developer chooses TCP. Which THREE features are provided by TCP?

Accepted Answer

Flow control using window size. TCP provides a three-way handshake, sequence numbering for ordering, and flow control.

Answer

Multicast support

Answer

Simple header with minimal overhead

Question 15

Which wireless standard operates in both 2.4 GHz and 5 GHz bands and is commonly known as Wi-Fi 6?

Accepted Answer

802.11ax. 802.11ax (Wi-Fi 6) supports both 2.4 GHz and 5 GHz bands, offering improved efficiency.

Answer

802.11n

Answer

802.11ac

Answer

802.11g