CCST Networking Fundamentals 5 — Questions and Answers
Question 1: Which protocol is used to securely manage network devices remotely over an encrypted connection?
- Telnet
- FTP
- SSH (Correct answer)
- SNMP
Correct answer: SSH
SSH (Secure Shell) encrypts the management session between the administrator and the network device, replacing insecure Telnet.
Question 2: What does 'half-duplex' mean in the context of network communication?
- Data can only flow in one direction permanently
- Data can flow in both directions simultaneously
- Data can flow in only one direction at a time (Correct answer)
- Data is transmitted in two separate channels
Correct answer: Data can flow in only one direction at a time
Half-duplex allows data to travel in both directions but not at the same time — one side must finish transmitting before the other can send.
Question 3: Which private IP address range is defined by RFC 1918 for Class A networks?
- 172.16.0.0 – 172.31.255.255
- 192.168.0.0 – 192.168.255.255
- 10.0.0.0 – 10.255.255.255 (Correct answer)
- 169.254.0.0 – 169.254.255.255
Correct answer: 10.0.0.0 – 10.255.255.255
RFC 1918 reserves 10.0.0.0/8 for Class A private use, providing over 16 million host addresses within a single organization.
Question 4: What is the primary purpose of NAT (Network Address Translation)?
- Encrypt traffic between networks
- Allow multiple private IP devices to share one public IP address (Correct answer)
- Assign IP addresses to hosts
- Translate domain names to IP addresses
Correct answer: Allow multiple private IP devices to share one public IP address
NAT allows devices with private IP addresses to access the internet by translating their addresses to one or more public IP addresses at the router.
Question 5: Which Ethernet frame field is used to detect transmission errors?
- Preamble
- EtherType
- FCS (Frame Check Sequence) (Correct answer)
- Destination MAC
Correct answer: FCS (Frame Check Sequence)
The FCS field contains a CRC value calculated by the sender; the receiver recalculates and compares it to detect bit errors in the frame.
Question 6: Which command-line tool tests connectivity and measures round-trip time to a remote host using ICMP echo requests?
- tracert
- nslookup
- ping (Correct answer)
- netstat
Correct answer: ping
The ping command sends ICMP Echo Request packets and reports whether the destination is reachable along with the round-trip latency.
Question 7: What does CSMA/CD stand for, and which network technology uses it?
- Carrier Sense Multiple Access / Collision Detection — used in traditional wired Ethernet (Correct answer)
- Carrier Signal Multiplexing / Channel Division — used in fiber optics
- Circuit Switching Multiple Access / Channel Delay — used in WAN links
- Controlled Slot Multiple Access / Collision Detection — used in Wi-Fi
Correct answer: Carrier Sense Multiple Access / Collision Detection — used in traditional wired Ethernet
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is the media access method used by legacy half-duplex Ethernet to detect and recover from frame collisions.
CCST Networking Fundamentals 5
Which protocol is used to securely manage network devices remotely over an encrypted connection?