CCNA Intro to Networks Quiz 4

What layer of the OSI model is responsible for routing messages between networks?

• Data Link

• Physical

• Network

• Application

Answer explanation

The Network layer of the OSI model is responsible for routing messages between networks. It manages the delivery of packets across multiple networks, making it the correct choice for this question.

Which of the following is a private IP address?

• 8.8.8.8

• 192.168.1.1

• 172.15.10.1

• 200.1.1.1

Answer explanation

The private IP address ranges are 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255. Among the options, 192.168.1.1 falls within the private range, making it the correct choice.

What protocol is used to find the MAC address of a device from its IP address?

• DNS

• DHCP

• ARP

• ICMP

Answer explanation

ARP (Address Resolution Protocol) is used to map an IP address to a MAC address. When a device needs to communicate with another device on a local network, it uses ARP to discover the MAC address associated with the target IP address.

Which of the following is a Layer 2 device?

• Router

• Switch

• Firewall

• Hub

Answer explanation

A switch is a Layer 2 device that operates at the data link layer, forwarding frames based on MAC addresses. In contrast, routers operate at Layer 3, and firewalls and hubs do not specifically function as Layer 2 devices.

What does DNS stand for?

• Data Network Service

• Domain Name System

• Distributed Network System

• Data Name Service

Answer explanation

DNS stands for Domain Name System, which is a system that translates human-friendly domain names into IP addresses, allowing users to access websites easily.

Which protocol is used to assign IP addresses automatically in a network?

• DNS

• HTTP

• DHCP

• FTP

Answer explanation

DHCP (Dynamic Host Configuration Protocol) is the protocol used to automatically assign IP addresses to devices on a network, allowing them to communicate effectively without manual configuration.

What is the purpose of a subnet mask?

• To mask errors in transmission

• To divide an IP network into subnetworks

Answer explanation

The purpose of a subnet mask is to divide an IP network into subnetworks, allowing for better management and organization of IP addresses within a larger network.

Which layer of the OSI model is responsible for logical addressing and routing?

• Data Link

• Network

• Transport

• Session

Answer explanation

The Network layer of the OSI model is responsible for logical addressing and routing. It ensures that data packets are sent from the source to the destination across multiple networks.

Which of the following IP addresses is considered a private address under IPv4?

• 172.16.5.4

• 8.8.8.8

• 192.0.0.1

• 130.45.67.89

Answer explanation

The IP address 172.16.5.4 is a private address as it falls within the range of 172.16.0.0 to 172.31.255.255, which is designated for private networks. The other options are public IP addresses.

Which protocol is used by routers to exchange routing information between autonomous systems?

• OSPF

• RIP

• EIGRP

• BGP