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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. Dynamic ports fall into what category of port
Window size
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Ephermeral
Routing table

2. ACK is?
Routing table
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Acknowledgment field significant
Not - these are done by other protocols in other layers

3. How many bytes of overhead do TCP segments carry? How many does UDP carry?
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
20 and 8
49152 - 65535.
HTTPS (Secure HTTP)

4. Port 520 is?
DNS - video-streaming - VoIP
RIP (Routing Information Protocol)
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

5. What is a broadcast domain?
Decapsulation
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
False. It's like a file - only one process can read/write.

6. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol
Packet

7. In networking terms - What is reliability?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
It means ensuring that each segment that the source sends arrives at the destination
UDP

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

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9. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
RIP (Routing Information Protocol)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
HTTPS (Secure HTTP)

10. SYN is?
Synchronize sequence numbers
The source and destination port number
Web browsing - email - file transfer
1

11. What is the purpose of the ToS field in the IPv4 header?
The default gateway address is the address of a router interface that is connected to the same network as the host.
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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

12. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
POP3
Connectionless

13. List three network applications that use UDP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
An alternate HTTP port

14. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Connectionless
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

15. Port 23 is?
Purpose - ownership - and geographic location are key ways to divide a network
Telnet
Not - these are done by other protocols in other layers
The source and destination port number

16. What is the netstat utility used for on a host?
TFTP - Trivial File Transfer Protocol
Netstat -r and route print
Connectionless
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

17. Port 8080 is?
1
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
POP3
An alternate HTTP port

18. Port 20 is?
Allows the transport layer function on the destination host to reassemble segments in the right order
FTP
Connectionless - Best effort (unreliable) - media independent
It means ensuring that each segment that the source sends arrives at the destination

19. What is the proper order of FIN sequence?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
32 - there are four octets of 8 bits each in an IPv4 address
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
20 and 8

20. 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)
POP3
FIN
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

21. What are the transport layer's responsibilities?
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer
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
20 and 8

22. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Acknowledgment field significant
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Maximum transmission unit
Upper

23. Port 25 is?
Does not
Routing table
FTP
SMTP

24. 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
TCP
Decapsulation
Destination network - next-hop - metric

25. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
Transport
TCP
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

26. MSN messenger uses TCP or UDP?
Destination network - next-hop - metric
TCP
Gateway
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

27. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Window size
Routers (the subnetting process)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport 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

28. How does UDP keep track of sequence numbers?

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29. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
32 - there are four octets of 8 bits each in an IPv4 address
RIP (Routing Information Protocol)

30. 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?
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
Static routing
Ephermeral
SMTP

31. IP is designed or not designed to track and manage the flow of packets?
It means ensuring that each segment that the source sends arrives at the destination
FTP
Window size
Not - these are done by other protocols in other layers

32. Port 443 is?
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
TFTP - Trivial File Transfer Protocol
HTTPS (Secure HTTP)
POP3

33. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
It means ensuring that each segment that the source sends arrives at the destination
Data link - physical
Connectionless
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

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

35. Why is IP 'media independent'?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It works the same on all Layer 1 media
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

36. Routers add routes for the connected networks to their ________________ .
POP3
Routing table
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Not - these are done by other protocols in other layers

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

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38. Port 110 is?
POP3
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
Routing table

39. What is the purpose of TCP/UDP port numbers?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Window size
It Doesn't - TCP does
To track the different conversations crossing the network at the same time

40. 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?
Allows the transport layer function on the destination host to reassemble segments in the right order
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.

41. IP requires that each sending and receiving device have a __________ IP address.
Purpose - ownership - and geographic location are key ways to divide a network
Synchronize sequence numbers
Unique
DNS - video-streaming - VoIP

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

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43. How many bits are in an IPv6 address?
20 and 8
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
IRC
128

44. Which of the following are true about IP?
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.
Data link - physical
Routers (the subnetting process)
It is the most common - and it encapsulates transport layer segments

45. Ephermeral port is what type of port
Dynamic / private
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
Ephermeral

46. MTU stands for ?
Routing table
Allows the transport layer function on the destination host to reassemble segments in the right order
Connectionless - Best effort (unreliable) - media independent
Maximum transmission unit

47. On a particular network how would you determine the default gateway address for a host?
Allows the transport layer function on the destination host to reassemble segments in the right order
The default gateway address is the address of a router interface that is connected to the same network as the host.
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 means ensuring that each segment that the source sends arrives at the destination

48. Port 194 is?
IRC
TCP. It makes larger demands on a network
Not - these are done by other protocols in other layers
32 - there are four octets of 8 bits each in an IPv4 address

49. TCP is a ________________ layer protocol.
Transport
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
Window size
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

50. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Destination network - next-hop - metric
UDP - it sends datagrams as 'best effort'
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.