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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 kinds of problems are caused by excessive broadcast traffic on a network segment?
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.
128
Upper
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

2. Which of the following are not functions of the network layer?
Allows the transport layer function on the destination host to reassemble segments in the right order
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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

3. During data transfer - What is the receiving host responsible for?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It is the most common - and it encapsulates transport layer segments

4. What is the purpose of TCP/UDP port numbers?
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.
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
To track the different conversations crossing the network at the same time

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

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6. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
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.
TCP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

7. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

8. Port 25 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
It Doesn't - TCP does
The default gateway address is the address of a router interface that is connected to the same network as the host.
SMTP

9. 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.
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
The source and destination port number
Unique

10. What does segmentation provide to communications?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

11. What is the port range for Registered ports
Transport
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
Dynamic / private
Static routing

12. Port 20 is?
53
SMTP
Window size
FTP

13. Why does TCP use a sequence number in the 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
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
20 and 8

14. What are the three basic characteristics of IPv4?
Purpose - ownership - and geographic location are key ways to divide a network
TCP
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

15. Routers add routes for the connected networks to their ________________ .
Routing table
Dynamic / private
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
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

16. What is the protocol number for UDP?
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Maximum transmission unit
49152 - 65535.

17. 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?
Not - these are done by other protocols in other layers
Connectionless - Best effort (unreliable) - media independent
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
32 - there are four octets of 8 bits each in an IPv4 address

18. What information does a router need to successfully forward packets?
FIN
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
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

19. What are three key factors to consider when grouping hosts into a common network?
Purpose - ownership - and geographic location are key ways to divide a network
Telnet
Packet
HTTPS (Secure HTTP)

20. TCP is a ________________ layer protocol.
TCP
Transport
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
DNS - video-streaming - VoIP

21. What two commands can be used to view a host's routing table?
Dynamic / private
Netstat -r and route print
Transport
Static routing

22. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
DNS - video-streaming - VoIP
Reliable - connection-oriented protocol (resends if not received)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Decapsulation

23. The three-way handshake performs what three functions?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
All
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

24. 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
HTTPS (Secure HTTP)
1
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. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Static routing
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
Netstat -r and route print

26. Port 110 is?
To track the different conversations crossing the network at the same time
The source and destination port number
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
POP3

27. Port 520 is?
RIP (Routing Information Protocol)
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
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
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

28. Are well known ports registered
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

29. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Data link - physical
Does not
49152 - 65535.
20 and 8

30. IP is designed or not designed to track and manage the flow of packets?
Transport
Not - these are done by other protocols in other layers
All
Synchronize sequence numbers

31. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Window size
It Doesn't - TCP does
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
Gateway

32. Port 443 is?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Routing table
Gateway
HTTPS (Secure HTTP)

33. MSN messenger uses TCP or UDP?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Connectionless
TCP
Does not

34. UDP stands for?
User Datagram Protocol
DNS - video-streaming - VoIP
53
Allows the transport layer function on the destination host to reassemble segments in the right order

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

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36. In networking terms - What is reliability?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Packet
FTP
It means ensuring that each segment that the source sends arrives at the destination

37. Name the private address blocks
32 - there are four octets of 8 bits each in an IPv4 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
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
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

38. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Upper
False. It's like a file - only one process can read/write.
Telnet

39. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
Destination network - next-hop - metric
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

40. What is the port range for well known ports
Purpose - ownership - and geographic location are key ways to divide a network
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Synchronize sequence numbers
It works the same on all Layer 1 media

41. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Web browsing - email - file transfer
Forward the packet to the default route interface (gateway) or just drop/discard the packets
DNS - video-streaming - VoIP
Packet

42. Port 23 is?
Telnet
TCP. It makes larger demands on a network
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

43. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
32 - there are four octets of 8 bits each in an IPv4 address
Static routing
Telnet

44. Which of the following are true about network layer encapsulation?
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.
Telnet
It means ensuring that each segment that the source sends arrives at the destination
Acknowledgment and reassembly (receipt of packets and putting them in right order)

45. 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)
Dynamic / private
FIN
UDP
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

46. MTU stands for ?
FTP
Maximum transmission unit
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

47. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Maximum transmission unit
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Upper
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

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

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49. What is the netstat utility used for on a host?
DNS - video-streaming - VoIP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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.
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

50. 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.
Reliable - connection-oriented protocol (resends if not received)
Gateway
Routing table
Data link - physical