Computer Network Quiz
Questions: 16 · 10 minutes
1. What does a DHCP server typically provide to a client?
A permanent MAC address and physical switch port
A list of all files hosted on the local network
An encrypted tunnel to every remote network
IP configuration such as an address, subnet mask, and default gateway
2. What is the principal role of a router in a computer network?
Converting domain names into IP addresses
Providing electrical power to every connected device
Storing web pages for all local clients
Forwarding packets between different IP networks
3. Several home devices use private IPv4 addresses but share one public IPv4 address when accessing the internet. Which router function enables this arrangement?
Network Address Translation
Domain name recursion
Ethernet flow control
Spanning Tree Protocol
4. A host has the address 192.168.5.137 with a /24 prefix. What is its network address?
192.168.5.255
192.168.5.137
192.168.5.0
192.168.0.0
5. Which port is normally used by HTTPS when no alternative port is specified?
TCP port 443
TCP port 53
TCP port 80
TCP port 22
6. A 2.4 GHz Wi-Fi connection becomes slow whenever a nearby microwave oven is operating. What is the most likely explanation?
The microwave is assigning duplicate IP addresses
Radio-frequency interference is degrading the wireless signal
The router is changing all traffic from TCP to UDP
DNS records are expiring whenever the oven starts
7. Traceroute reveals the sequence of routers toward a destination by sending probes with progressively changing values in which IP field?
Source port
Header checksum
Time to Live, or TTL
Differentiated Services Code Point, or DSCP
8. Which IPv4 address is within a range reserved for private networks?
8.8.8.8
198.51.100.25
172.20.5.1
224.0.0.5
9. Two computers have addresses 192.168.10.25/24 and 192.168.10.200/24. Assuming normal configuration, how can they exchange traffic?
Only through their configured default gateway
Directly on the local subnet without sending it through a router
Only after DNS translates both addresses
Through a public NAT gateway because their host portions differ
10. When forwarding an Ethernet frame within a local network, which value does a standard Layer 2 switch primarily examine?
The destination MAC address
The destination TCP port
The destination URL
The destination process ID
11. A desktop loses network access, and the Ethernet link light is off. Following a bottom-up troubleshooting approach, what should be checked first?
Whether the DNS cache contains an old record
The cable, connector, and network interface link state
Whether the browser accepts cookies
The remote server's application permissions
12. Two devices communicate over a properly configured full-duplex Ethernet link. What can they do that a half-duplex link does not permit?
Use the same IP address without conflict
Communicate without using MAC addresses
Automatically encrypt every Ethernet frame
Send and receive data simultaneously
13. A user can open a website by entering its IP address, but the site's domain name does not work. Which service should be investigated first?
DHCP
SSH
NTP
DNS
14. What is the primary function of the Domain Name System (DNS)?
Assigning IP addresses to devices automatically
Translating domain names into IP addresses
Encrypting traffic between web browsers and servers
Forwarding Ethernet frames between switch ports
15. A laptop is set to obtain an IPv4 address automatically. It cannot reach the DHCP server and assigns itself an address beginning with 169.254. What type of address is this?
A private address assigned by NAT
A loopback address
A link-local address
A multicast address
16. Which combination of features helps TCP provide reliable, ordered data delivery?
Sequence numbers, acknowledgements, and retransmissions
Name resolution, caching, and recursive queries
MAC learning, VLAN tagging, and frame flooding
Address translation, port mapping, and route summarization