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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. Which is a connection-oriented protocol - TCP or UDP?
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
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It means ensuring that each segment that the source sends arrives at the destination

2. What is the purpose of the ToS field in the IPv4 header?
FIN
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
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.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

3. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Acknowledgment field significant
Unique

4. Why is IP 'media independent'?
It works the same on all Layer 1 media
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
Synchronize sequence numbers
Acknowledgment field significant

5. Which of the following are true about static and dynamic routing?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FTP
Not - these are done by other protocols in other layers

6. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Allows the transport layer function on the destination host to reassemble segments in the right order
RIP (Routing Information Protocol)

7. The three-way handshake performs what three functions?
The source and destination port number
Maximum transmission unit
Purpose - ownership - and geographic location are key ways to divide a network
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

8. What is the proper order of SYN sequence?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TCP
Upper
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

9. What is the port range for well known ports
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
IRC

10. TCP header provides for
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
Connectionless - Best effort (unreliable) - media independent
SMTP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

11. Port 110 is?
128
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.
TCP uses flow control
POP3

12. MSN messenger uses TCP or UDP?
Unique
UDP - it sends datagrams as 'best effort'
TCP uses flow control
TCP

13. Which of the following are true about network layer encapsulation?
Ephermeral
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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless

14. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
128
Destination network - next-hop - metric
Routing table

15. Why does TCP use a sequence number in the header?
IRC
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TCP

16. What is the port range for dynamic or private ports
Decapsulation
Purpose - ownership - and geographic location are key ways to divide a network
49152 - 65535.
Forward the packet to the default route interface (gateway) or just drop/discard the packets

17. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
IRC
POP3
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

18. What are the transport layer's responsibilities?
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
User Datagram Protocol
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

19. Port 23 is?
Telnet
IRC
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
It works the same on all Layer 1 media

20. Dynamic ports fall into what category of port
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP. It makes larger demands on a network
Does not
Ephermeral

21. What does segmentation provide to communications?
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
User Datagram Protocol

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

23. What is the purpose of TCP/UDP port numbers?
Data link - physical
TFTP - Trivial File Transfer Protocol
To track the different conversations crossing the network at the same time
It Doesn't - TCP does

24. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
TCP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
It Doesn't - TCP does
Upper

25. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
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
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.
Static routing

26. TCP is a ________________ layer protocol.
All
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
32 - there are four octets of 8 bits each in an IPv4 address
Transport

27. Routers add routes for the connected networks to their ________________ .
UDP
Routing table
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
IRC

28. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
20 and 8
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

29. How does UDP keep track of sequence numbers?

30. What is the protocol number for UDP?
Connectionless
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
32 - there are four octets of 8 bits each in an IPv4 address
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

31. SYN is?
False. It's like a file - only one process can read/write.
FIN
Synchronize sequence numbers
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.

32. UDP does or does not create a session?
Does not
User Datagram Protocol
Gateway
128

33. Which of the following is true about IP?

34. Which is a connectionless protocol - UDP or TCP?
Ephermeral
UDP
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

35. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Destination network - next-hop - metric
The default gateway address is the address of a router interface that is connected to the same network as the host.
Packet
Data link - physical

36. 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?
An alternate HTTP port
Netstat -r and route print
Static routing
49152 - 65535.

37. Pieces of information about a route that a routing table contains
Static routing
It works the same on all Layer 1 media
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

38. What is the purpose of sequence numbers?
DNS - video-streaming - VoIP
Not - these are done by other protocols in other layers
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
Allows the transport layer function on the destination host to reassemble segments in the right order

39. What is a broadcast domain?
UDP - it sends datagrams as 'best effort'
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
128
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

40. On a particular network how would you determine the default gateway address for a host?
Maximum transmission unit
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
Purpose - ownership - and geographic location are key ways to divide a network
The default gateway address is the address of a router interface that is connected to the same network as the host.

41. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?

42. 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)
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
FIN
UDP
Purpose - ownership - and geographic location are key ways to divide a network

43. Port 20 is?
FTP
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
POP3
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

44. Encapsulation occurs at all - some or none of the layers of the OSI model?
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
128
All
Data link - physical

45. In networking terms - What is reliability?
Netstat -r and route print
53
It means ensuring that each segment that the source sends arrives at the destination
Dynamic / private

46. What is the port range for Registered ports
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
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

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

48. Ephermeral port is what type of port
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Dynamic / private
Connectionless

49. What four tasks does the network layer perform?
Dynamic / private
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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.

50. What is the default DNS port number?
53
TCP
FTP
Transport