CCNA 1 v6.0 Chapter 3 Quiz Answers 2019

CCNA 1 v6.0 Chapter 3 Quiz Answers Cisco Last Update 2019

This quiz covers the content in CCNA R&S Introduction to Networks Chapter 3. It is designed to provide an additional opportunity to practice the skills and knowledge presented in the chapter and to prepare for the Chapter 3 Exam.

1. Which message delivery option is used when all devices need to receive the same message simultaneously?


When all devices need to receive the same message simultaneously, the message would be delivered as a broadcast. Unicast delivery occurs when one source host sends a message to one destination host. The sending of the same message from a host to a group of destination hosts is multicast delivery. Duplex communications refers to the ability of the medium to carry messages in both directions.

2. What layer of the TCP/IP protocol model determines the best path through the network?

network access

The TCP/IP model consists of four layers: application, transport, internet, and network access. The internet layer determines the best path through the network.

3. At which layer of the OSI model would a physical address be encapsulated?

physical layer
data link layer*
network layer
transport layer

Physical addresses are encapsulated at the data link layer. Logical addresses, also known as IP addresses, are encapsulated at the network layer. Port addresses are encapsulated at the transport layer. No addresses are encapsulated at the physical layer.

4. If the default gateway is configured incorrectly on the host, what is the impact on communications?

The host is unable to communicate on the local network.
The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.*
The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.
There is no impact on communications.

A default gateway is only required to communicate with devices on another network. The absence of a default gateway does not affect connectivity between devices on the same local network.

5. What three requirements are defined by the protocols used in network communcations to allow message transmission across a network? (Choose three.)

connector specifications
message encoding*
media selection
message size*
delivery options*
end-device installation

The protocols used in network communications define the details of how a message is transmitted, including requirements for message delivery options, message timing, message encoding, formatting and encapsulation, and message size.

6. What is the general term that is used to describe a piece of data at any layer of a networking model?

protocol data unit*

The term protocol data unit (PDU) is used to describe a piece of data at any layer of a networking model. A packet is the PDU at the network layer. A frame is the data link layer PDU. A segment is the PDU at the transport layer.

7. What is the purpose of protocols in data communications?

specifying the bandwidth of the channel or medium for each type of communication
specifying the device operating systems that will support the communication
providing the rules required for a specific type of communication to occur*
dictating the content of the message sent during communication

Protocols provide rules that define how a message is transmitted across a network. Implementation requirements such as electronic and bandwidth details for data communication are specified by standards. Operating systems are not specified by protocols, but will implement protocols. Protocols determine how and when to send a message but they do not control the contents of a message.

8. Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?


The OSI model consists of seven layers: application, presentation, session, transport, network, data link, and physical. The transport layer defines services to segment, transfer, and reassemble the data for individual communications between the end devices.

9. Why are open standards important in the data communications industry?

They are required for devices to gain access to the Internet.
They eliminate the threat of security breaches.
They enable interoperability between software and hardware from different vendors.*
They encourage network organizations to develop proprietary software to retain their competitive edge.

Open standard protocols facilitate interoperability between software and hardware made by different manufactures. For example, open standards allow a client with a Linux operating system to connect to a server running a Microsoft Windows operating system. They would also be able to successfully exchange data. If all software, hardware, and protocols were proprietary, this would not be possible.

10. Which logical address is used for delivery of data to a remote network?

destination MAC address
destination IP address*
destination port number
source MAC address
source IP address

The destination IP address is used for end-to-end delivery of data to a remote network. The destination MAC address is used for delivery on a local network. The destination port number identifies the application that should process the data at the destination. Source addresses identify the sender of the data.

11. Fill in the blank.

The MAC address of a PC does not change when the PC is moved to a different network because the MAC address is embedded in the    “NIC”      of the PC.

The MAC address is also known as the physical or Ethernet address. Because it is encoded on hardware, on the Ethernet NIC, it will stay the same no matter where the NIC is geographically located.

Noted: There are 6 answers. You can use one of the following in netacad: NIC, network interface card, network card, Ethernet NIC, Ethernet network interface card, and Ethernet network card.

12. Which three acronyms/initialisms represent standards organizations? (Choose three.)


TCP/IP is a protocol stack that contains a lot of other protocols such as HTTP, FTP, and DNS. The TCP/IP protocol stack is required to be used when communicating on the Internet. A MAC address is an address that is burned into an Ethernet network card. OSI is the 7 layer model that is used to explain how networking works.

13. What type of delivery uses data link layer addresses?

remote delivery
local and remote delivery
local delivery*
remote delivery using routers

If a device is sending frames to another device on the same local network, it uses ARP to determine the MAC address of the receiving device. The sending device then uses the Layer 2 addresses to send the frames.

14. What type of message is sent to a specific group of hosts?


A communication from a single source to a single destination is called a unicast. A communication from a single source to a group of destinations is called a multicast. A communication from a single source to all destinations on the same local network is called a broadcast.

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