1. Question 1

Role of a proxy server?

• ❌ Manage network traffic and connect networks

• ❌ Encrypt/decrypt data

• ❌ Control incoming/outgoing traffic

• ✅ Forward requests from clients to the appropriate server while hiding IP addresses

Explanation:
A proxy forwards client requests and hides their real IP for privacy and control.

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2. Question 2

What does Wi-Fi 6 use for improved performance?

• ❌ CDMA

• ❌ TDMA

• ✅ OFDMA

• ❌ FHSS

Explanation:
Wi-Fi 6 uses OFDMA to serve multiple devices efficiently at the same time.

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3. Question 3

What does “/24” mean in IPv4?

• ❌ Subnet mask 255.255.0.0

• ❌ Range of IPs

• ✅ First 24 bits are for the network portion

• ❌ Default gateway

Explanation:
/24 represents a subnet mask of 255.255.255.0 — network bits = 24.

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4. Question 4

Role of a subnet mask?

• ❌ Define range of valid IPs

• ❌ Determine default gateway

• ✅ Divide an IP address into network and host portions

• ❌ Encrypt IP

Explanation:
A subnet mask determines which part of the IP is the network and which part is host.

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5. Question 5

What does the ARP table store?

• ❌ Routes to all destinations

• ✅ MAC addresses of devices directly connected to the local network

• ❌ All IPs + DNS names

• ❌ Only default gateway info

Explanation:
ARP maps IP → MAC for devices in the same LAN.

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6. Question 6

Hardware that joins two separate networks?

• ❌ Repeater

• ❌ Switch

• ❌ Bridge

• ✅ Gateway

Explanation:
A gateway connects different networks using different protocols.

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7. Question 7

Protocol responsible for sending emails?

• ❌ IMAP4

• ❌ DNS

• ✅ SMTP

• ❌ POP3

Explanation:
SMTP handles sending emails; POP3/IMAP handle receiving.

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🧾 Summary Table