Cisco Semester 1, CH 14-15 Quiz Questions
How many exchanges are needed to end both sessions between two hosts?
Four exchanges
True or false? Resource sharing over SMB is only supported on Microsoft operating systems.
False
Which is a feature of IMAP?
It downloads a copy of email messages leaving the original on the server
Which protocol uses encryption?
HTTPS
Which of the following DNS resource record types resolves authoritative name servers?
NS
Which applications or services allow hosts to act as client and server at the same time?
P2P applications
Which transport layer feature is used to establish a connection-oriented session?
TCP 3-way handshake
Which statement is true about FTP?
The client can download data from or upload data to the server.
Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?
The client randomly selects a source port number
Which of the following is displayed by the nslookup utility?
The configured default DNS server
What happens if part of an FTP message is not delivered to the destination?
The part of the FTP message that was lost is re-sent
Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices?
-ACK -SYN
These three OSI layers define the same functions as the TCP/IP model application layer.
-Application -Presentation -Session
Which two fields are the same in a TCP and UDP header?
-Destination port -Source port
Which two applications would use the TCP transport layer protocol?
-FTP -HTTP
Which three application layer protocols use TCP?
-FTP -HTTP -SMTP
A manufacturing company subscribes to certain hosted services from its ISP. The services that are required include hosted world wide web, file transfer, and e-mail. Which protocols represent these three key applications?
-HTTP -FTP -SMTP
Which three protocols or standards are used at the application layer of the TCP/IP model?
-HTTP -MPEG -GIF
Which two tasks can be performed by a local DNS server?
-Mapping name-to-IP addresses for internal hosts -Forwarding name resolution requests between servers
Which two characteristics are associated with UDP sessions?
-Received data is unacknowledged. -Destination devices receive traffic with minimal delay
Which two operations are provided by TCP but not by UDP?
-Retransmitting unacked data -Acking received data
Which two applications would use the UDP transport layer protocol?
-TFTP -VoIP
What is true about the Server Message Block protocol?
Clients establish a long term connection to servers.
A wireless host needs to request an IPv4 address. What protocol would be used to process the request?
DHCP
Which protocol or service uses UDP for a client-to-server communication and TCP for server-to-server communication?
DNS
How does a networked server manage requests from multiple clients for different services?
Each request has a combination of source and destination port numbers, coming from a unique IP address
This is a function of the OSI session layer.
Exchange of information to initiate dialog between peers
True or false? A DNS server that receives a request for a name resolution that is not within its DNS zone will send a failure message to the requesting client.
False
True or false? DHCP clients send a DHCP request message to available DHCP servers.
False
True or false? HTTP is a secure protocol.
False
True or false? The peer-to-peer networking model requires the implementation of a dedicated server for data access.
False
What message type is used by an HTTP client to request data from a web server?
GET
What is a common protocol that is used with peer-to-peer applications such as WireShare, Bearshare, and Shareaza?
Gnutella
This protocol is used by a web browser to establish a connection to a web server.
HTTP
Which protocol is used by a client to communicate securely with a web server?
HTTPS
When retrieving email messages, which protocol allows for easy, centralized storage and backup of emails that would be desirable for a small- to medium-sized business?
IMAP
Which TCP header statement is true?
It consists of 10 fields in a 20 byte header
Which UDP header statement is true?
It consists of 4 fields in an 8 bytes header
Why is DHCP for IPv4 preferred for use on large networks?
It is more efficient than static address assignment is
What does a client do when it has UDP datagrams to send?
It just sends the datagrams.
Why is UDP desirable for protocols that make a simple request and reply transactions?
Low Overhead
Which protocol can be used to transfer messages from an email server to an email client?
POP3
This message type is used when uploading data files to a web server.
POST
MKV, GIF, and JPG standards are associated with which OSI layer?
Presentation
Which application layer protocol is used to provide file-sharing and print services to Microsoft applications?
SMB
What is an advantage of SMB over FTP?
SMB clients can establish a long-term connection to the server.
This protocol is used by a client to send email to a mail server.
SMTP
Which two protocols may devices use in the application process that sends email?
SMTP DNS
Which control bit flags are used during the three-way handshake?
SYN and ACK
What field is used by the destination host to reassemble segments into the original order?
Sequence Number
Which of the following would be valid source and destination ports for a host connecting to a DNS server?
Source: 49152, Destination 53
Which of the following would be valid source and destination ports for a host connecting to an email server?
Source: 49152, Destination:25
Which transport layer protocol ensures reliable same-order delivery?
TCP
What happens when a sending host senses there is congestion?
The sending host reduces the number of bytes it sends before receiving an ack
Network congestion has resulted in the source learning of the loss of TCP segments that were sent to the destination. What is one way that the TCP protocol addresses this?
The source decreases the amount of data that it transmits before it receives an ack from the destination
What is the purpose of using a source port number in a TCP communication?
To keep track of multiple conversations between devices
Which layer is responsible for establishing a temporary communication session between the source and destination host applications?
Transport Layer
True or false? FTP data transfers take place from client to server (push) and from server to client (pull).
True
True or false? In a peer-to-peer network environment every peer can function as both a client and a server.
True
Which of the following is a stateless best-effort delivery transport layer protocol?
UDP
Which transport layer protocol would be used for VoIP applications?
UDP
Which three are transport layer responsibilities?
-Conversation Multiplexing -Segmenting Data and reassembling segments -Tracking Individual Conversations
Which three protocols operate at the application layer of the TCP/IP model?
-DHCP -FTP -POP3
Which two are protocols that belong in the OSI application layer?
-DNS -SMTP
Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead?
-DNS -VoIP
What part of the URL, ht​tp://ww​w.cisco.com/index.html, represents the top-level DNS domain?
.com
What is the complete range of TCP and UDP well-known ports?
0 to 1023
Which UDP datagram reassembly statement is true?
UDP reassembles the data in the order that it was received
Which of the following is a feature of the Gnutella protocol?
Users can share whole files with other users
What field is used to provide flow control?
Window Size
An author is uploading one chapter document from a personal computer to a file server of a book publisher. What role is the personal computer assuming in this network model?
client
Which field in the TCP header indicates the status of the three-way handshake process?
control bits
Which of these ports are used by FTP?
20 and 21
Which of the following DNS record types is used to resolve IPv6 addresses?
AAAA
What are two characteristics of the application layer of the TCP/IP model?
-The closest to the end user -The creation and maintenance of dialogue between source and destination applications
Which three statements describe a DHCP Discover message?
-The destination IP address is 255.255.255.255. -All hosts receive the message, but only a DHCP server replies. -The message comes from a client seeking an IP address.
Which transport layer protocol statement is true?
-UDP is a best-effort delivery protocol
Which two types of applications are best suited for UDP?
-applications that can tolerate some data loss, but require little or no delay -applications that handle reliability themselves
What are three responsibilities of the transport layer?
-meeting the reliability requirements of applications -identifying the applications and services on the client and server that should handle transmitted data -multiplexing multiple communication streams from many users or applications on the same network
What are two characteristics of peer-to-peer networks?
-resource sharing without a dedicated server -decentralized resources
In what two situations would UDP be better than TCP as the preferred transport protocol?
-when a faster delivery mechanism is needed -when applications do not need to guarantee delivery of the data
Which two fields are included in the TCP header but not in the UDP header?
-window -sequence number
A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC
10
Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair?
10.1.1.10:1099, 10.1.1.254:80
Which number or set of numbers represents a socket?
192.168.1.1:80
How many connections are required by FTP between client and server?
2
A PC that is communicating with a web server has a TCP window size of 6,000 bytes when sending data and a packet size of 1,500 bytes. Which byte of information will the web server acknowledge after it has received two packets of data from the PC?
3001
A client creates a packet to send to a server. The client is requesting HTTP service. What number will be used as the destination port number in the sending packet?
80
On a home network, which device is most likely to provide dynamic IPv4 addressing to clients on the home network?
A home router
Which scenario describes a function provided by the transport layer?
A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.
What is an example of network communication that uses the client-server model?
A workstation initiates a DNS request when the user types www.cisco.com in the address bar of a web browser
Which flag in the TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?
ACK
This layer of the OSI model is concerned with the protocols that exchange data between programs running on hosts.
Application
Which OSI layer provides the interface between the applications used to communicate and the underlying network over which messages are transmitted?
Application
Which TCP/IP model layer is closest to the end user?
Application
What type of applications are best suited for using UDP?
Applications that are sensitive to dely
Which peer-to-peer application allows users to share pieces of many files with each other at the same time?
BitTorrent
What do the client/server and peer-to-peer network models have in common?
Both models support devices in server and client roles
What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?
destination and source port numbers
Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?
netstat
What is a key characteristic of the peer-to-peer networking model?
resource sharing without a dedicated server
What TCP mechanism is used to enhance performance by allowing a device to continuously send a steady stream of segments as long as the device is also receiving necessary acknowledgements?
sliding window
Which factor determines TCP window size?
the amount of data the destination can process at one time
What is a socket?
the combination of a IP address and port number
What is a responsibility of transport layer protocols?
tracking individual conversations
Which port group includes port numbers for FTP, HTTP, and TFTP applications?
well-known
