200-901 Network Fundamentals Practice Test 2 — 15 Questions

Question 1

An engineer is troubleshooting a connectivity issue between two devices on different VLANs. The switch connecting the devices is configured with 802.1Q trunking. At which OSI layer do VLANs operate?

Accepted Answer

Layer 2. VLANs operate at Layer 2 (Data Link) because they segment broadcast domains based on MAC addresses and logical grouping, but they do not involve IP routing (Layer 3).

Answer

Layer 4

Answer

Layer 1

Answer

Layer 3

Question 2

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 3

A network administrator needs to assign IP addresses to devices on a subnet with a /25 prefix. How many usable host addresses are available?

Accepted Answer

126. A /25 subnet has 7 bits for hosts (32-25=7), giving 2^7 = 128 total addresses, minus 2 (network and broadcast) = 126 usable hosts.

Answer

254

Answer

64

Answer

128

Question 4

A developer is building a real-time video streaming application that must minimize delay, even if some packets are lost. Which transport protocol is most appropriate, and why?

Accepted Answer

UDP, because it has lower overhead and no retransmission delay.. UDP is suitable for real-time streaming because it is connectionless and does not retransmit lost packets, reducing latency. TCP's retransmission and ordering would cause delays.

Answer

TCP, because it provides flow control to avoid congestion.

Answer

UDP, because it guarantees packet delivery.

Answer

TCP, because it ensures all packets arrive in order.

Question 5

Which DNS record type is used to map a domain name to an IPv6 address?

Accepted Answer

AAAA. The AAAA (quad-A) record is the DNS resource record type defined in RFC 3596 to map a fully qualified domain name to a 128-bit IPv6 address. Unlike the A record, which stores a 32-bit IPv4 address, the AAAA record holds the longer IPv6 address, enabling clients to resolve hostnames to IPv6 destinations.

Answer

A

Answer

CNAME

Answer

MX

Question 6

An organization has a web server that needs to be reachable via both 'www.example.com' and 'example.com'. Which DNS record type should be used to make 'example.com' an alias for 'www.example.com'?

Accepted Answer

CNAME record. A CNAME record creates an alias that points to the canonical name. The A record points to an IP address, not another domain.

Answer

A record

Answer

MX record

Answer

NS record

Question 7

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 8

A network engineer is configuring a wireless network for a hospital that requires high throughput and minimal interference from neighboring networks. Which set of 2.4 GHz channels should be used for non-overlapping coverage?

Accepted Answer

1, 6, 11. In the 2.4 GHz ISM band, channels 1, 6, and 11 are the only three non-overlapping channels, each separated by 25 MHz, which prevents co-channel interference. This configuration maximizes throughput and minimizes interference from neighboring networks, making it ideal for high-density environments like hospitals.

Answer

2, 7, 12

Answer

1, 5, 9

Answer

1, 3, 5

Question 9

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 10

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 11

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 12

A network administrator notices that a host with IP 192.168.1.10/25 cannot communicate with a host at 192.168.1.200/25. What is the most likely reason?

Accepted Answer

The subnet mask is incorrect; they are on different subnets.. With a /25 mask (255.255.255.128), the network is divided into two subnets: 192.168.1.0-127 and 192.168.1.128-255. The two hosts are in different subnets and require a router to communicate.

Answer

The default gateway is missing.

Answer

The ARP cache is corrupted.

Answer

The hosts are using different DNS servers.

Question 13

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.. TLS provides encryption and uses certificates for authentication. HTTP/2 is an application layer protocol, not a TLS feature. Port 443 is the default for HTTPS, but TLS itself does not define the port. TLS uses symmetric encryption for session keys.

Answer

It supports multiplexing of multiple streams.

Answer

It is an application layer protocol like HTTP.

Answer

It uses port 443 by default.

Question 14

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 separates the control plane from the data plane, allowing network administrators to automate configuration changes through a centralized controller (e.g., OpenFlow or Cisco APIC-EM). This eliminates the need for manual, device-by-device CLI changes, reducing human error and enabling rapid, consistent updates across the entire network.

Answer

Reduced need for network engineers.

Answer

Built-in encryption for all network traffic.

Question 15

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

Accepted Answer

DNS. DNS and DHCP use UDP because they are lightweight and can tolerate some loss. HTTP uses TCP, and SMTP uses TCP.

Answer

HTTP

Answer

SMTP

Answer

SSH