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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. Ephermeral port is what type of port
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.
Transport
Dynamic / private
TCP

2. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Synchronize sequence numbers
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Reliable - connection-oriented protocol (resends if not received)
TCP

3. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
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
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.
User Datagram Protocol

4. Which is a connection-oriented protocol - TCP or UDP?
TFTP - Trivial File Transfer Protocol
TCP
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
Acknowledgment field significant

5. 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.
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
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

6. Port 20 is?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FTP
RIP (Routing Information Protocol)
HTTPS (Secure HTTP)

7. What two commands can be used to view a host's routing table?
Netstat -r and route print
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
User Datagram Protocol
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

8. MTU stands for ?
TCP
Maximum transmission unit
FTP
UDP

9. What is the port range for Registered ports
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.
53
All
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

10. Port 8080 is?
Window size
An alternate HTTP port
Does not
FTP

11. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Dynamic / private
User Datagram Protocol
FIN
TCP. It makes larger demands on a network

12. 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
53
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

13. IP requires that each sending and receiving device have a __________ IP address.
Unique
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Web browsing - email - file transfer
SMTP

14. TCP is a ________________ layer protocol.
Telnet
Netstat -r and route print
Transport
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

15. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
Static routing
False. It's like a file - only one process can read/write.
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

16. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
49152 - 65535.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Dynamic / private

17. Port 69 is?
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
TFTP - Trivial File Transfer Protocol
Web browsing - email - file transfer

18. SYN is?
Dynamic / private
Synchronize sequence numbers
Acknowledgment field significant
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

19. What is the purpose of the ToS field in the IPv4 header?
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.
Not - these are done by other protocols in other layers
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
Allows the transport layer function on the destination host to reassemble segments in the right order

20. 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?
Destination network - next-hop - metric
Static routing
FTP
Maximum transmission unit

21. IP is designed or not designed to track and manage the flow of packets?
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
Acknowledgment field significant
Maximum transmission unit
Not - these are done by other protocols in other layers

22. Which of the following are not functions of the network layer?
Connectionless
It means ensuring that each segment that the source sends arrives at the destination
1
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

23. What is a broadcast domain?
Static routing
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Data link - physical
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

24. Why does TCP use a sequence number in the header?
TFTP - Trivial File Transfer Protocol
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
Web browsing - email - file transfer
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

25. What is the default DNS port number?
Reliable - connection-oriented protocol (resends if not received)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
53
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

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27. What is the protocol number for UDP?
32 - there are four octets of 8 bits each in an IPv4 address
IRC
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Purpose - ownership - and geographic location are key ways to divide a network

28. Why is IP 'media independent'?
Upper
49152 - 65535.
Reliable - connection-oriented protocol (resends if not received)
It works the same on all Layer 1 media

29. Port 110 is?
POP3
Packet
Static routing
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

30. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Does not

31. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
Connectionless - Best effort (unreliable) - media independent
Data link - physical
TFTP - Trivial File Transfer Protocol

32. Pieces of information about a route that a routing table contains
TCP. It makes larger demands on a network
Allows the transport layer function on the destination host to reassemble segments in the right order
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.

33. Dynamic ports fall into what category of port
Connectionless
Routers (the subnetting process)
HTTPS (Secure HTTP)
Ephermeral

34. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
HTTPS (Secure HTTP)
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. It makes larger demands on a network

35. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
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.

36. What is the port range for well known ports
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
Acknowledgment field significant
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

37. 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
An alternate HTTP port
IRC

38. Are well known ports registered
RIP (Routing Information Protocol)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
UDP - it sends datagrams as 'best effort'

39. UDP stands for?
Acknowledgment field significant
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
User Datagram Protocol

40. What is the proper order of SYN sequence?
20 and 8
Decapsulation
128
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

41. Port 520 is?
Connectionless
SMTP
Dynamic / private
RIP (Routing Information Protocol)

42. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
An alternate HTTP port
DNS - video-streaming - VoIP
False. It's like a file - only one process can read/write.

43. Port 23 is?
POP3
Upper
Telnet
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

44. 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?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
Transport

45. 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
49152 - 65535.
20 and 8
32 - there are four octets of 8 bits each in an IPv4 address

46. What information does a router need to successfully forward packets?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
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

47. What is the netstat utility used for on a host?
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
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

48. Port 194 is?
Reliable - connection-oriented protocol (resends if not received)
IRC
32 - there are four octets of 8 bits each in an IPv4 address
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

49. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

50. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
1
Connectionless - Best effort (unreliable) - media independent