RCNA Practice Questions

Which layer of the OSI model is responsible for routing packets?

• Data Link

• Network

• Transport

• Session

What is the default subnet mask for a Class C IP address?

• 255.255.0.0

• 255.0.0.0

• 255.255.255.0

• 255.255.255.128

Which command displays the routing table on a Cisco router?

• show interfaces

• show routes

• show ip route

• show ip interface brief

What is the primary purpose of a router?

• Connect devices in the same LAN

• Filter traffic based on MAC addresses

• Connect multiple networks and forward packets

• Provide wireless connectivity

Which of the following is a connectionless protocol?

• TCP

• UDP

• HTTP

• FTP

How many usable IP addresses are in a /29 subnet?

• 2

• 4

• 6

• 8

Which protocol is used to automatically assign IP addresses?

• DNS

• ARP

• DHCP

• ICMP

What is the purpose of the ARP protocol?

• Map IP address to MAC address

• Encrypt data

• Assign IP addresses

• Check connectivity

Which command is used to test reachability to another host?

• tracert

• nslookup

• ipconfig

• ping

Which layer of the OSI model does TCP operate on?

• Network

• Transport

• Data Link

• Session