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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. What are three key factors to consider when grouping hosts into a common network?
Data link - physical
Dynamic / private
Connectionless
Purpose - ownership - and geographic location are key ways to divide a network

2. What is the port range for well known ports
Routers (the subnetting process)
Maximum transmission unit
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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

3. IP is designed or not designed to track and manage the flow of packets?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
49152 - 65535.
Not - these are done by other protocols in other layers
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

4. SYN is?
Gateway
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
To track the different conversations crossing the network at the same time
Synchronize sequence numbers

5. UDP does or does not create a session?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless - Best effort (unreliable) - media independent
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Does not

6. Port 194 is?
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.
IRC
128
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

7. What is the purpose of sequence numbers?
Ephermeral
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Allows the transport layer function on the destination host to reassemble segments in the right order
It means ensuring that each segment that the source sends arrives at the destination

8. What is the proper order of FIN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Gateway

9. Port 8080 is?
The default gateway address is the address of a router interface that is connected to the same network as the host.
All
An alternate HTTP port
53

10. 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
HTTPS (Secure HTTP)
49152 - 65535.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

11. Which is a connectionless protocol - UDP or TCP?
False. It's like a file - only one process can read/write.
Netstat -r and route print
UDP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

12. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
It is the most common - and it encapsulates transport layer segments
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
Window size
Purpose - ownership - and geographic location are key ways to divide a network

13. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Ephermeral
FIN
Connectionless
Reliable - connection-oriented protocol (resends if not received)

14. Pieces of information about a route that a routing table contains
Packet
Upper
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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.

15. What two commands can be used to view a host's routing table?
Netstat -r and route print
Allows the transport layer function on the destination host to reassemble segments in the right order
Maximum transmission unit
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

16. Which is a connection-oriented protocol - TCP or UDP?
All
TCP
Gateway
It works the same on all Layer 1 media

17. MSN messenger uses TCP or UDP?
TCP
POP3
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Allows the transport layer function on the destination host to reassemble segments in the right order

18. What is contained in the header of each segment or datagram?
Data link - physical
All
The source and destination port number
It is the most common - and it encapsulates transport layer segments

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

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20. List three network applications that use TCP
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer
POP3
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

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

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22. What does segmentation provide to communications?
Dynamic / private
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TCP uses flow control

23. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
It means ensuring that each segment that the source sends arrives at the destination
Packet
Acknowledgment field significant
Maximum transmission unit

24. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Data link - physical
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

25. Dynamic ports fall into what category of port
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP
TCP
Ephermeral

26. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Allows the transport layer function on the destination host to reassemble segments in the right order
Routers (the subnetting process)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
20 and 8

27. Encapsulation occurs at all - some or none of the layers of the OSI model?
Dynamic / private
All
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

28. 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
Data link - physical
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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.

29. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
All
Purpose - ownership - and geographic location are key ways to divide a network
IRC
1

30. In networking terms - What is reliability?
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
It means ensuring that each segment that the source sends arrives at the destination
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

31. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
RIP (Routing Information Protocol)
It means ensuring that each segment that the source sends arrives at the destination
Data link - physical

32. Port 20 is?
UDP
49152 - 65535.
FTP
Telnet

33. Routers add routes for the connected networks to their ________________ .
Routing table
Connectionless
Telnet
Unique

34. Which of the following are true about network layer encapsulation?
Telnet
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
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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

35. The three main features of routes in a routing table are?
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.
Destination network - next-hop - metric
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
The source and destination port number

36. Port 25 is?
Unique
Destination network - next-hop - metric
SMTP
UDP - it sends datagrams as 'best effort'

37. Name the private address blocks
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
POP3
FTP

38. What is the purpose of the ToS field in the IPv4 header?
Packet
32 - there are four octets of 8 bits each in an IPv4 address
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.

39. Are well known ports registered
1
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
FIN

40. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
Reliable - connection-oriented protocol (resends if not received)
The source and destination port number
20 and 8

41. MTU stands for ?
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
49152 - 65535.
Maximum transmission unit
TCP

42. IP requires that each sending and receiving device have a __________ IP address.
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
Unique
It is the most common - and it encapsulates transport layer segments
Synchronize sequence numbers

43. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Packet
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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

44. Port 520 is?
RIP (Routing Information Protocol)
TCP uses flow control
Acknowledgment field significant
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.

45. Port 69 is?
53
TCP uses flow control
TFTP - Trivial File Transfer Protocol
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

46. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
FTP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)

47. 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
Netstat -r and route print
Decapsulation
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

48. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
HTTPS (Secure HTTP)
POP3
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

49. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
Routing table
Not - these are done by other protocols in other layers
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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

50. On a particular network how would you determine the default gateway address for a host?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Maximum transmission unit
Forward the packet to the default route interface (gateway) or just drop/discard the packets
The default gateway address is the address of a router interface that is connected to the same network as the host.