CCST Networking Fundamentals 4 — Questions and Answers
Question 1: Which protocol operates at the Transport layer and provides connection-oriented, reliable data delivery?
- UDP
- IP
- TCP (Correct answer)
- ICMP
Correct answer: TCP
TCP (Transmission Control Protocol) uses a three-way handshake, sequencing, and acknowledgments to ensure reliable, ordered data delivery.
Question 2: What is the well-known port number used by HTTPS?
- 80
- 110
- 443 (Correct answer)
- 8080
Correct answer: 443
HTTPS (HTTP Secure) uses TCP port 443 to provide encrypted web communications via TLS/SSL.
Question 3: Which device operates at Layer 1 of the OSI model and simply regenerates electrical signals?
- Switch
- Hub
- Router
- Repeater (Correct answer)
Correct answer: Repeater
A repeater operates at the Physical layer, amplifying and regenerating signals to extend the distance of a network segment without inspecting traffic.
Question 4: What type of address is FF:FF:FF:FF:FF:FF?
- Unicast MAC address
- Multicast IP address
- Broadcast MAC address (Correct answer)
- Loopback address
Correct answer: Broadcast MAC address
FF:FF:FF:FF:FF:FF is the Layer 2 broadcast MAC address, causing all devices on a LAN segment to receive and process the frame.
Question 5: Which wireless standard operates exclusively in the 5 GHz band and offers speeds up to 3.5 Gbps?
- 802.11b
- 802.11g
- 802.11n
- 802.11ac (Correct answer)
Correct answer: 802.11ac
802.11ac (Wi-Fi 5) operates only in the 5 GHz band and achieves theoretical speeds up to 3.5 Gbps using MU-MIMO and wider channels.
Question 6: A user can ping a server by IP but not by hostname. Which service is most likely failing?
- DHCP
- DNS (Correct answer)
- FTP
- SMTP
Correct answer: DNS
DNS (Domain Name System) translates hostnames to IP addresses; if name resolution fails, connectivity by hostname fails even though IP-level connectivity works.
Question 7: What is the function of a default gateway?
- Assign IP addresses to local hosts
- Forward traffic destined for remote networks (Correct answer)
- Provide DNS name resolution
- Filter traffic based on MAC addresses
Correct answer: Forward traffic destined for remote networks
The default gateway is a router interface that forwards packets from the local network to remote networks when no more-specific route exists.
CCST Networking Fundamentals 4
Which protocol operates at the Transport layer and provides connection-oriented, reliable data delivery?