Cisco CCNA 1 Routing and Switching : Network Protocols and Communication Chapter 3 Quiz 3
Problem 1
Question :
1. What type of delivery uses data link layer addresses?
Answer Option Choices :
remote delivery
local and remote delivery
local delivery
remote delivery using routers
Correct Answer :
local delivery
Explanation :
Refer to curriculum topic: 3.3.2
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.
Problem 2
Question :
What three requirements are defined by the protocols used in network communications to allow message transmission across a network? (Choose three.)
Answer Option Choices :
connector specifications
message encoding
media selection
message size
delivery options
end-device installation
Correct Answer :
message encoding
message size
delivery options
Explanation :
Refer to curriculum topic: 3.1.1
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.
Problem 3
Question :
What is the purpose of protocols in data communications?
Answer Option Choices :
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
Correct Answer :
providing the rules required for a specific type of communication to occur
Explanation :
Refer to curriculum topic: 3.1.1
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.
Problem 4
Question :
Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?
Answer Option Choices :
application
presentation
session
transport
network
Correct Answer :
transport
Explanation :
Refer to curriculum topic: 3.2.4
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.
Problem 5
Question :
What is the general term that is used to describe a piece of data at any layer of a networking model?
Answer Option Choices :
frame
packet
protocol data unit
segment
Correct Answer :
protocol data unit
Explanation :
Refer to curriculum topic: 3.3.1
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.
Problem 6
Question :
Why are open standards important in the data communications industry?
Answer Option Choices :
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.
Correct Answer :
They enable interoperability between software and hardware from different vendors.
Explanation :
Refer to curriculum topic: 3.2.3
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.
Problem 7
Question :
If the default gateway is configured incorrectly on the host, what is the impact on communications?
Answer Option Choices :
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.
Correct Answer :
The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.
Explanation :
Refer to curriculum topic: 3.3.2
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.
Problem 8
Question :
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 of the PC.
Correct Answer :
NIC
Another Correct Answer :
network interface card
network card
Ethernet NIC
Ethernet network interface card
Ethernet network card
Explanation :
Refer to curriculum topic: 3.3.2
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.
Problem 9
Question :
What layer of the TCP/IP protocol model determines the best path through the network?
Answer Option Choices :
application
transport
internet
network access
Correct Answer :
internet
Explanation :
Refer to curriculum topic: 3.2.4
The TCP/IP model consists of four layers: application, transport, internet, and network access. The internet layer determines the best path through the network.
Problem 10
Question :
Which message delivery option is used when all devices need to receive the same message simultaneously?
Answer Option Choices :
duplex
unicast
multicast
broadcast
Correct Answer :
broadcast
Explanation :
Refer to curriculum topic: 3.1.1
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.
Problem 11
Question :
What type of message is sent to a specific group of hosts?
Answer Option Choices :
static
unicast
dynamic
multicast
broadcast
Correct Answer :
multicast
Explanation :
Refer to curriculum topic: 3.1.1
A communication that has a single source going 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.
Problem 12
Question :
Which logical address is used for delivery of data to a remote network?
Answer Option Choices :
destination MAC address
destination IP address
destination port number
source MAC address
source IP address
Correct Answer :
destination IP address
Explanation :
Refer to curriculum topic: 3.3.2
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.
Problem 13
Question :
At which layer of the OSI model would a physical address be encapsulated?
Answer Option Choices :
physical layer
data link layer
network layer
transport layer
Correct Answer :
data link layer
Explanation :
Refer to curriculum topic: 3.3.2
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.
Problem 14
Question :
Answer Option Choices :
IANA
TCP/IP
IEEE
IETF
OSI
MAC
Correct Answer :
IANA
IEEE
IETF
Explanation :
Refer to curriculum topic: 3.2.3
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.