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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. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Window size
Netstat -r and route print
To track the different conversations crossing the network at the same time

2. In networking terms - What is reliability?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Ephermeral
Static routing
It means ensuring that each segment that the source sends arrives at the destination

3. Port 8080 is?
TCP
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
An alternate HTTP port

4. 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)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
FTP
Routers (the subnetting process)

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

6. Port 110 is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It works the same on all Layer 1 media
Unique
POP3

7. What are three key factors to consider when grouping hosts into a common network?
POP3
UDP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Purpose - ownership - and geographic location are key ways to divide a network

8. Why does TCP use a sequence number in the 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.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Data link - physical
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

9. ACK is?
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP
49152 - 65535.
Acknowledgment field significant

10. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
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

11. Routers add routes for the connected networks to their ________________ .
IRC
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

12. TCP header provides for
Static routing
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
False. It's like a file - only one process can read/write.

13. 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)
False. It's like a file - only one process can read/write.
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
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

14. Port 69 is?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol

15. What is the purpose of the ToS field in the IPv4 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
Acknowledgment field significant
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.
TFTP - Trivial File Transfer Protocol

16. IP requires that each sending and receiving device have a __________ IP address.
Reliable - connection-oriented protocol (resends if not received)
Unique
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

17. What is the port range for dynamic or private ports
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
To track the different conversations crossing the network at the same time
49152 - 65535.

18. How many bytes of overhead do TCP segments carry? How many does UDP carry?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Netstat -r and route print
20 and 8
Acknowledgment field significant

19. Are well known ports registered
32 - there are four octets of 8 bits each in an IPv4 address
Data link - physical
Transport
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

20. Ephermeral port is what type of port
Dynamic / private
The default gateway address is the address of a router interface that is connected to the same network as the host.
Unique
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

21. List three network applications that use TCP
Data link - physical
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Web browsing - email - file transfer
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

22. Which of the following is true about IP?

23. List three network applications that use UDP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
DNS - video-streaming - VoIP
TCP

24. The router a network uses to send and receive messages beyond the network is called a ___________ router.
It means ensuring that each segment that the source sends arrives at the destination
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Gateway

25. Which is a connection-oriented protocol - TCP or UDP?
TCP
Destination network - next-hop - metric
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Reliable - connection-oriented protocol (resends if not received)

26. 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.
TCP. It makes larger demands on a network
Maximum transmission unit
32 - there are four octets of 8 bits each in an IPv4 address

27. 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)
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.
FIN
TCP
32 - there are four octets of 8 bits each in an IPv4 address

28. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
Static routing
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It is the most common - and it encapsulates transport layer segments

29. UDP does or does not create a session?
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.
UDP - it sends datagrams as 'best effort'
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Does not

30. What is the netstat utility used for on a host?
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
Dynamic / private
Ephermeral
False. It's like a file - only one process can read/write.

31. What is the proper order of FIN sequence?
Netstat -r and route print
128
20 and 8
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

32. Pieces of information about a route that a routing table contains
Packet
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
An alternate HTTP port
HTTPS (Secure HTTP)

33. UDP stands for?
Routing table
User Datagram Protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
SMTP

34. The three-way handshake performs what three functions?
Synchronize sequence numbers
HTTPS (Secure HTTP)
Acknowledgment field significant
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

35. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Destination network - next-hop - metric
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
20 and 8
Static routing

36. Which is a connectionless protocol - UDP or TCP?
IRC
UDP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Unique

37. What information does a router need to successfully forward 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.
TCP uses flow control
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
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

38. What two commands can be used to view a host's routing table?
DNS - video-streaming - VoIP
Netstat -r and route print
Upper
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

39. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Routers (the subnetting process)
Decapsulation
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

40. MSN messenger uses TCP or UDP?
Synchronize sequence numbers
All
TCP
To track the different conversations crossing the network at the same time

41. Port 23 is?
Gateway
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.
To track the different conversations crossing the network at the same time
Telnet

42. What is the proper order of SYN sequence?
128
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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

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

44. Which of the following are true about static and dynamic routing?
Netstat -r and route print
Routers (the subnetting process)
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

45. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
TCP uses flow control
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
It means ensuring that each segment that the source sends arrives at the destination

46. What is the port range for well known ports
Routing table
Synchronize sequence numbers
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

47. The three main features of routes in a routing table are?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
Decapsulation

48. How many bits are in an IPv6 address?
128
Reliable - connection-oriented protocol (resends if not received)
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
Telnet

49. Which protocol ensures more reliable delivery between applications - TCP or UDP?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
TCP. It makes larger demands on a network

50. IP is designed or not designed to track and manage the flow of packets?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Not - these are done by other protocols in other layers
DNS - video-streaming - VoIP