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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. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Connectionless - Best effort (unreliable) - media independent
TCP uses flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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

2. The router a network uses to send and receive messages beyond the network is called a ___________ router.
49152 - 65535.
Telnet
It Doesn't - TCP does
Gateway

3. Which of the following are true about IP?
TCP
Connectionless - Best effort (unreliable) - media independent
It is the most common - and it encapsulates transport layer segments
The source and destination port number

4. 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)
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.
The source and destination port number
20 and 8
FIN

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

6. During data transfer - What is the receiving host responsible for?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Reliable - connection-oriented protocol (resends if not received)
Acknowledgment and reassembly (receipt of packets and putting them in right order)

7. UDP stands for?
User Datagram Protocol
It is the most common - and it encapsulates transport layer segments
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
Ephermeral

8. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Acknowledgment field significant
Packet
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

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

10. What is the proper order of FIN sequence?
Routing table
49152 - 65535.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Allows the transport layer function on the destination host to reassemble segments in the right order

11. Port 8080 is?
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
An alternate HTTP port
Synchronize sequence numbers
TFTP - Trivial File Transfer Protocol

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

13. Dynamic ports fall into what category of port
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Connectionless
Transport
Ephermeral

14. Which of the following are true about static and dynamic routing?
IRC
Connectionless - Best effort (unreliable) - media independent
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.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

15. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Packet
Gateway
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

16. What is the default DNS port number?
53
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
1
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

17. Name the private address blocks
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
49152 - 65535.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Data link - physical

18. Why does TCP use a sequence number in the header?
It Doesn't - TCP does
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

19. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Connectionless
20 and 8
TCP. It makes larger demands on a network
Purpose - ownership - and geographic location are key ways to divide a network

20. What is the port range for dynamic or private ports
49152 - 65535.
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

21. Port 69 is?
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
UDP

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

23. Port 443 is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Web browsing - email - file transfer
Does not
HTTPS (Secure HTTP)

24. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
It means ensuring that each segment that the source sends arrives at the destination
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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

25. UDP does or does not create a session?
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
Does not
SMTP
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

26. Which is a connection-oriented protocol - TCP or UDP?
TCP
HTTPS (Secure HTTP)
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP uses flow control

27. 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
Maximum transmission unit
Synchronize sequence numbers

28. List three network applications that use TCP
SMTP
53
Web browsing - email - file transfer
TCP uses flow control

29. The three main features of routes in a routing table are?
SMTP
Destination network - next-hop - metric
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
TCP uses flow control

30. IP requires that each sending and receiving device have a __________ IP address.
RIP (Routing Information Protocol)
It means ensuring that each segment that the source sends arrives at the destination
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Unique

31. What four tasks does the network layer perform?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
Reliable - connection-oriented protocol (resends if not received)

32. TCP is a ________________ layer protocol.
Telnet
TCP. It makes larger demands on a network
Transport
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

33. Pieces of information about a route that a routing table contains
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.
Connectionless
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

34. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Packet
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

35. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FIN
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

36. How many bits are in an IPv6 address?
128
Purpose - ownership - and geographic location are key ways to divide a network
TFTP - Trivial File Transfer Protocol
Netstat -r and route print

37. Are well known ports registered
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 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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Acknowledgment field significant

38. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Reliable - connection-oriented protocol (resends if not received)
It is the most common - and it encapsulates transport layer segments
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.

39. Port 23 is?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Gateway
Telnet
FTP

40. What are three key factors to consider when grouping hosts into a common network?
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
UDP - it sends datagrams as 'best effort'
Purpose - ownership - and geographic location are key ways to divide a network

41. What are the transport layer's responsibilities?
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

42. Encapsulation occurs at all - some or none of the layers of the OSI model?
RIP (Routing Information Protocol)
Window size
All
False. It's like a file - only one process can read/write.

43. ACK is?
Upper
Acknowledgment field significant
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

44. What is the proper order of SYN sequence?
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)
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
RIP (Routing Information Protocol)

45. Port 110 is?
POP3
FTP
Maximum transmission unit
TCP. It makes larger demands on a network

46. How does UDP keep track of sequence numbers?

47. What is a broadcast domain?
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
FTP
FIN
Decapsulation

48. In networking terms - What is reliability?
Decapsulation
It means ensuring that each segment that the source sends arrives at the destination
Gateway
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

49. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Routers (the subnetting process)
Decapsulation
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

50. SYN 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
Synchronize sequence numbers
FTP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control