CCST Network Protocols and Services 1 — Questions and Answers
Question 1: Which protocol automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to network clients?
- DNS
- ARP
- DHCP (Correct answer)
- NAT
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) dynamically assigns IP configuration parameters to network hosts from a central server.
Question 2: On which well-known UDP ports does DHCP operate for server and client communication?
- Port 80 and 443
- Port 53 and 5353
- Port 67 (server) and 68 (client) (Correct answer)
- Port 137 and 138
Correct answer: Port 67 (server) and 68 (client)
DHCP servers listen on UDP port 67 and clients receive responses on UDP port 68.
Question 3: What is the primary function of DNS (Domain Name System)?
- Assign IP addresses to hosts dynamically
- Translate domain names into IP addresses (Correct answer)
- Encrypt web traffic between client and server
- Route packets between different networks
Correct answer: Translate domain names into IP addresses
DNS resolves human-readable domain names (e.g., www.cisco.com) into numerical IP addresses that routers use to forward packets.
Question 4: Which protocol provides secure, encrypted remote command-line access to network devices, replacing Telnet?
- FTP
- SNMP
- SSH (Correct answer)
- TFTP
Correct answer: SSH
SSH (Secure Shell) encrypts the entire session including credentials, replacing the insecure plaintext Telnet protocol.
Question 5: HTTP and HTTPS use which well-known TCP ports respectively?
- 80 and 8080
- 80 and 443 (Correct answer)
- 443 and 8443
- 21 and 22
Correct answer: 80 and 443
HTTP uses TCP port 80 for unencrypted web traffic, while HTTPS uses TCP port 443 for TLS/SSL-encrypted web traffic.
Question 6: Which protocol is used by network management systems to monitor and manage network devices, and on which UDP port does it operate?
- ICMP on port 1
- SNMP on port 161 (Correct answer)
- Syslog on port 514
- NTP on port 123
Correct answer: SNMP on port 161
SNMP (Simple Network Management Protocol) uses UDP port 161 to poll managed devices and UDP port 162 for trap notifications.
CCST Network Protocols and Services 1
Which protocol automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to network clients?