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Cisco Network Fundamentals - 2

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Maximum transmission unit
Window size
Acknowledgment field significant
DNS - video-streaming - VoIP

2. The three-way handshake performs what three functions?
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
20 and 8
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.

3. What is contained in the header of each segment or datagram?
32 - there are four octets of 8 bits each in an IPv4 address
The source and destination port number
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

4. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
32 - there are four octets of 8 bits each in an IPv4 address
Ephermeral
Forward the packet to the default route interface (gateway) or just drop/discard the packets

5. What is the purpose of TCP/UDP port numbers?
Destination network - next-hop - metric
To track the different conversations crossing the network at the same time
User Datagram Protocol
Reliable - connection-oriented protocol (resends if not received)

6. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Reliable - connection-oriented protocol (resends if not received)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
All
TCP. It makes larger demands on a network

7. What is the netstat utility used for on a host?
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
Decapsulation
Not - these are done by other protocols in other layers

8. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
HTTPS (Secure HTTP)
Upper
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.

9. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Unique
User Datagram Protocol
All
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

10. Which is a connection-oriented protocol - TCP or UDP?
Static routing
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
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

11. 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)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless
FIN
TCP

12. What is the default DNS port number?
Packet
POP3
32 - there are four octets of 8 bits each in an IPv4 address
53

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

14. List three network applications that use UDP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Web browsing - email - file transfer
DNS - video-streaming - VoIP
It is the most common - and it encapsulates transport layer segments

15. What is a broadcast domain?
32 - there are four octets of 8 bits each in an IPv4 address
Maximum transmission unit
DNS - video-streaming - VoIP
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

16. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
POP3
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless
Reliable - connection-oriented protocol (resends if not received)

17. Are well known ports registered
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Destination network - next-hop - metric
It is the most common - and it encapsulates transport layer segments
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

18. Encapsulation occurs at all - some or none of the layers of the OSI model?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
All
32 - there are four octets of 8 bits each in an IPv4 address
It means ensuring that each segment that the source sends arrives at the destination

19. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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.
TCP
Dynamic / private

20. MTU stands for ?
HTTPS (Secure HTTP)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Maximum transmission unit
TCP

21. What does segmentation provide to communications?
Telnet
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

22. 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
It is the most common - and it encapsulates transport layer segments
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

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

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24. Port 25 is?
SMTP
It means ensuring that each segment that the source sends arrives at the destination
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Unique

25. Which of the following is true about IP?

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26. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
128
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
Routers (the subnetting process)

27. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Routers (the subnetting process)
Routing table
Does not

28. The three main features of routes in a routing table are?
Destination network - next-hop - metric
20 and 8
SMTP
TCP

29. SYN is?
Synchronize sequence numbers
Connectionless
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

30. TCP is a ________________ layer protocol.
Transport
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)
Destination network - next-hop - metric

31. UDP does or does not create a session?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Connectionless
Does not
It Doesn't - TCP does

32. 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?
Static routing
Telnet
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets

33. What is the port range for well known ports
Gateway
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
Routers (the subnetting process)

34. How does UDP keep track of sequence numbers?

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35. Port 443 is?
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
Purpose - ownership - and geographic location are key ways to divide a network
HTTPS (Secure HTTP)
1

36. What is the port range for dynamic or private ports
Maximum transmission unit
49152 - 65535.
It means ensuring that each segment that the source sends arrives at the destination
HTTPS (Secure HTTP)

37. ACK is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Acknowledgment field significant
FIN

38. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
The default gateway address is the address of a router interface that is connected to the same network as the host.
HTTPS (Secure HTTP)
SMTP

39. Dynamic ports fall into what category of port
Ephermeral
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
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.

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?
32 - there are four octets of 8 bits each in an IPv4 address
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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
DNS - video-streaming - VoIP

41. Routers add routes for the connected networks to their ________________ .
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It means ensuring that each segment that the source sends arrives at the destination
Routing table
32 - there are four octets of 8 bits each in an IPv4 address

42. Port 110 is?
POP3
Reliable - connection-oriented protocol (resends if not received)
1
An alternate HTTP port

43. How many bits are in an IPv6 address?
128
FTP
HTTPS (Secure HTTP)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

44. TCP header provides for
Routing table
TFTP - Trivial File Transfer Protocol
Data link - physical
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

45. What four tasks does the network layer perform?
Packet
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
RIP (Routing Information Protocol)
Transport

46. How many bits are in an IPv4 address?
It is the most common - and it encapsulates transport layer segments
Netstat -r and route print
Web browsing - email - file transfer
32 - there are four octets of 8 bits each in an IPv4 address

47. What are the transport layer's responsibilities?
Packet
TCP
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

48. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Destination network - next-hop - metric
128
FTP
Packet

49. What two commands can be used to view a host's routing table?
DNS - video-streaming - VoIP
Netstat -r and route print
Connectionless
It works the same on all Layer 1 media

50. Ephermeral port is what type of port
All
Data link - physical
Synchronize sequence numbers
Dynamic / private

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Cisco Network Fundamentals - 2

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