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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. List three network applications that use TCP
Web browsing - email - file transfer
HTTPS (Secure HTTP)
The source and destination port number
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.

2. Which of the following are true about IP?
Connectionless
It is the most common - and it encapsulates transport layer segments
Purpose - ownership - and geographic location are key ways to divide a network
53

3. Port 8080 is?
An alternate HTTP port
HTTPS (Secure HTTP)
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
TCP. It makes larger demands on a network

4. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Web browsing - email - file transfer
FIN
An alternate HTTP port

5. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
53
Data link - physical
Forward the packet to the default route interface (gateway) or just drop/discard the packets
20 and 8

6. Port 69 is?
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Packet
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
TFTP - Trivial File Transfer Protocol

7. What is the protocol number for UDP?
FTP
Forward the packet to the default route interface (gateway) or just drop/discard the packets
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer

8. Are well known ports registered
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
False. It's like a file - only one process can read/write.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

9. What is the netstat utility used for on a host?
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
Does not
DNS - video-streaming - VoIP
It means ensuring that each segment that the source sends arrives at the destination

10. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Upper
Routing table
All

11. What are the transport layer's responsibilities?
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
User Datagram Protocol
Ephermeral

12. TCP header provides for
UDP - it sends datagrams as 'best effort'
TCP uses flow control
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

13. MSN messenger uses TCP or UDP?
TCP
HTTPS (Secure HTTP)
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Ephermeral

14. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
Data link - physical
Allows the transport layer function on the destination host to reassemble segments in the right order
SMTP
User Datagram Protocol

15. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
It works the same on all Layer 1 media
Connectionless - Best effort (unreliable) - media independent
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
Static routing

16. How many bits are in an IPv4 address?
DNS - video-streaming - VoIP
32 - there are four octets of 8 bits each in an IPv4 address
1
POP3

17. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Purpose - ownership - and geographic location are key ways to divide a network
Routers (the subnetting process)
TFTP - Trivial File Transfer Protocol
1

18. Port 520 is?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
RIP (Routing Information Protocol)
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p

19. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
POP3
TCP uses flow control
Connectionless
Upper

20. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
TFTP - Trivial File Transfer Protocol
Unique
False. It's like a file - only one process can read/write.

21. What is the default DNS port number?
The default gateway address is the address of a router interface that is connected to the same network as the host.
Window size
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
53

22. Port 20 is?
DNS - video-streaming - VoIP
1
FTP
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction

23. List three network applications that use UDP
TCP. It makes larger demands on a network
DNS - video-streaming - VoIP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Connectionless

24. UDP stands for?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
User Datagram Protocol
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

25. Ports can be shared at the same time? (t/f)

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26. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
HTTPS (Secure HTTP)
Transport
TCP. It makes larger demands on a network

27. What is a broadcast domain?
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
DNS - video-streaming - VoIP
1

28. Which of the following are true about TCP and IP?

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29. The three main features of routes in a routing table are?
It works the same on all Layer 1 media
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Destination network - next-hop - metric
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

30. What is the port range for Registered ports
Not - these are done by other protocols in other layers
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
Gateway

31. What is contained in the header of each segment or datagram?
Unique
Routers (the subnetting process)
The source and destination port number
TFTP - Trivial File Transfer Protocol

32. TCP is a ________________ layer protocol.
32 - there are four octets of 8 bits each in an IPv4 address
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
Transport
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.

33. Why does TCP use a sequence number in the header?
To track the different conversations crossing the network at the same time
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
TCP
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p

34. Pieces of information about a route that a routing table contains
The source and destination port number
SMTP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
UDP - it sends datagrams as 'best effort'

35. What two commands can be used to view a host's routing table?
Destination network - next-hop - metric
Netstat -r and route print
Window size
Ephermeral

36. ACK is?
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Acknowledgment field significant
Connectionless - Best effort (unreliable) - media independent

37. During data transfer - What is the receiving host responsible for?
Data link - physical
Connectionless - Best effort (unreliable) - media independent
Acknowledgment and reassembly (receipt of packets and putting them in right order)
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255

38. Port 25 is?
It works the same on all Layer 1 media
SMTP
Data link - physical
Upper

39. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TCP uses flow control
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
To track the different conversations crossing the network at the same time

40. Port 23 is?
An alternate HTTP port
Telnet
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TFTP - Trivial File Transfer Protocol

41. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Upper
TCP. It makes larger demands on a network
Reliable - connection-oriented protocol (resends if not received)
20 and 8

42. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Data link - physical
Reliable - connection-oriented protocol (resends if not received)
Web browsing - email - file transfer

43. The router a network uses to send and receive messages beyond the network is called a ___________ router.
TCP
To track the different conversations crossing the network at the same time
User Datagram Protocol
Gateway

44. Which of the following is true about IP?

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45. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Upper
FTP
It is the most common - and it encapsulates transport layer segments
Decapsulation

46. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It means ensuring that each segment that the source sends arrives at the destination

47. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
Data link - physical
FTP
FIN
Netstat -r and route print

48. Which of the following are not functions of the network layer?
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
128
20 and 8

49. What are three key factors to consider when grouping hosts into a common network?
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
49152 - 65535.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Purpose - ownership - and geographic location are key ways to divide a network

50. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
UDP - it sends datagrams as 'best effort'
Gateway
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
Window size