Заметки ITшника

CCNA ENetwork Chapter 2
CCNA ENetwork Chapter 3
CCNA ENetwork Chapter 4
CCNA ENetwork Chapter 5
CCNA ENetwork Chapter 6

Why are port numbers included in the TCP header of a segment?
4 – to enable a receiving host to forward the data to the appropriate application

Which is an important characteristic of UDP?
2 – minimal delays in data delivery

After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of theresponse from the server?
3 – 80

Refer to the exhibit. What two pieces of information can be determined from the output that is shown?
(Выбрать 2)
2 – A termination request has been sent to 192.135.250.10.
3 – Communication with 64.100.173.42 is using HTTP Secure.

Which information is found in both the TCP and UDP header information?
4 – source and destination

With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
3 – 0 to 1023

Which event occurs during the transport layer three-way handshake?
2 – TCP initializes the sequence numbers for the sessions.

What are two features of the User Datagram Protocol (UDP)? (выбрать 2)
2 – low overhead
3 – connectionless

During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?
3 – The packets will be delivered and reassembled at the destination.

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Выбрать два.)
2 – This contains a Telnet request.
3 – This is a TCP header.

What is dynamically selected by the source host when forwarding data?
4 – source port

Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
4 – transport

Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
3 – UDP

Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?
2 – flow control
3 – session establishment
4 – numbering and sequencing

Why is flow control used for TCP data transfer?
3 – to prevent the receiver from being overwhelmed by incoming data

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?
1 – session establishment

Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?
2 – reach a timeout and resend the data that needs to be acknowledged

What mechanism is used by TCP to provide flow control as segments travel from source to destination?
3 – window size

Which two options represent Layer 4 addressing? (Выбрать два.)
3 – identifies the communicating applications
4 – identifies multiple conversations between the hosts

Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next
6 – Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1

Which two protocols are used to control the transfer of web resources from a web server to a client browser? (Выбрать два.)
4 – HTTP
5 – HTTPS

What are two forms of application layer software? (Выбрать два.)
1 – applications
4 – services

What application layer protocol describes the services that are used for file sharing in Microsoft networks?
3 – SMB

What are two characteristics of peer-to-peer networks? (Выбрать два.)
3 – decentralized resources
5 – resource sharing without a dedicated server

What three protocols operate at the Application layer of the OSI model? (Выбрать три.)
2 – DNS
4 – SMTP
5 – POP

What is the automated service that matches resource names with the required IP address?
4 – DNS

What are two characteristics of clients in data networks? (Выбрать два.)
2 – initiate data exchanges
4 – may upload data to servers

A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type? (Выбрать два.)
2 – Security is difficult to enforce.
5 – A computer that responds to a file sharing request is functioning as a server.

Which statements are correct concerning the role of the MTA in handling email? (Выбрать три.)
2 – receives email from the client’s MUA
4 – passes email to the MDA for final delivery
5 – uses SMTP to route email between servers

As compared to SSH, what is the primary disadvantage of telnet?
2 – does not support encryption

Which email components are used to forward mail between servers? (Choose two.)
3 – MTA
5 – SMTP

What application layer protocol is commonly used to support for file transfers between a client and a server?
3 – FTP

Which application layer protocols correctly match a corresponding function? (Выбрать два.)
2 – HTTP transfers data from a web server to a client
5 – Telnet provides a virtual connection for remote access

Refer to the exhibit. What is the destination port for the communication that is represented on line 5?
1 – 80
Which layer of the OSI model supplies services that allow user to interface with the network?
5 application

What is the purpose of resource records in DNS?
2 – used by the server to resolve names

A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model? (Choose two.)
1 – centralized administration
3 – security is easier to enforce

What are three properties of peer-to-peer applications? (Choose three.)
1 – acts as both a client and server within the same communication
3 – hybrid mode includes a centralized directory of files
4 – can be used in client-server networks

How does the application layer on a server usually process multiple client request for services?
4 – uses support from lower layer functions to distinguish between connections to the service

What is the role of the OSI application layer?
3 – provides the interface between the applications on either end of the network

Which statements correctly identify the role of intermediary devices in the network? (Choose three.)
1 – determine pathways for data
3 – retime and retransmit data signals
5 – manage data flows
Select the statements that are correct concerning network protocols. (Choose three.)
1 – define the structure of layer specific PDU’s
3 – outline the functions necessary for communications between layers
5 – require layer dependent encapsulations

What are two functions of encapsulation? (Выбрать два.)
4 – identifies pieces of data as part of the same communication
5 – ensures that data pieces can be directed to the correct receiving end device

What is a primary function of the trailer information added by the data link layer encapsulation?
1 – supports error detection
Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Выбрать два.)
3 – Physical
4 – Data Link

What is a PDU?
4 – a layer specific encapsulation

Which characteristic correctly refers to end devices in a network?
2 – originate data flow

Refer to the exhibit. “Cell A” at IP address 10.0.0.34 has established an IP session with “IP Phone 1″ at IP address
172.16.1.103. Based upon the graphic, which device type best describes the function of wireless device “Cell A?”
2 – an end device

Refer to the exhibit. Which three labels correctly identify the network types for the network segments that are shown?
(Выбрать три.)
2 – Network B — WAN
3 – Network C — LAN
6 – Network A — LAN

Метки:CCNA, Cisco

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