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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. Port 443 is?
HTTPS (Secure HTTP)
Gateway
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
49152 - 65535.

2. The three main features of routes in a routing table are?
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.
Destination network - next-hop - metric
Purpose - ownership - and geographic location are key ways to divide a network
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. Port 20 is?
FTP
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Synchronize sequence numbers
Gateway

4. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
49152 - 65535.
An alternate HTTP port

5. Port 23 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
Telnet
POP3
Netstat -r and route print

6. Which is a connectionless protocol - UDP or TCP?
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
Window size
UDP
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

7. What two commands can be used to view a host's routing table?
DNS - video-streaming - VoIP
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
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
Netstat -r and route print

8. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
Acknowledgment field significant

9. What is a broadcast domain?
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.
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
Does not

10. Name the private address blocks
Decapsulation
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
FIN
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

11. IP is designed or not designed to track and manage the flow of packets?
Unique
FTP
Not - these are done by other protocols in other layers
Netstat -r and route print

12. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Routers (the subnetting process)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
1

13. Port 25 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
Synchronize sequence numbers
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
SMTP

14. How does UDP keep track of sequence numbers?

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15. ACK is?
Acknowledgment field significant
Purpose - ownership - and geographic location are key ways to divide a network
FTP
20 and 8

16. 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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
FIN
Static routing

17. Why does TCP use a sequence number in the header?
Dynamic / private
49152 - 65535.
The source and destination port number
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

18. How many bytes of overhead do TCP segments carry? How many does UDP carry?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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.
Netstat -r and route print

19. How many bits are in an IPv6 address?
SMTP
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
128
UDP - it sends datagrams as 'best effort'

20. 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)
Synchronize sequence numbers
POP3
FTP

21. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Gateway
Unique
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper

22. Routers add routes for the connected networks to their ________________ .
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.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It Doesn't - TCP does
Routing table

23. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
It works the same on all Layer 1 media
It Doesn't - TCP does

24. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
TCP uses flow control
Decapsulation
UDP - it sends datagrams as 'best effort'
Reliable - connection-oriented protocol (resends if not received)

25. During data transfer - What is the receiving host responsible for?
Decapsulation
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Data link - physical
Acknowledgment and reassembly (receipt of packets and putting them in right order)

26. What is the port range for well known ports
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 Doesn't - TCP does
DNS - video-streaming - VoIP
Dynamic / private

27. 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.
User Datagram Protocol
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.
False. It's like a file - only one process can read/write.

28. Port 110 is?
POP3
Ephermeral
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
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

29. 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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Upper
Web browsing - email - file transfer

30. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
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
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 and reassembly (receipt of packets and putting them in right order)
Connectionless

31. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TCP. It makes larger demands on a network
It Doesn't - TCP does
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

32. Why is IP 'media independent'?
TCP. It makes larger demands on a network
Destination network - next-hop - metric
It works the same on all Layer 1 media
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.

33. Pieces of information about a route that a routing table contains
Acknowledgment and reassembly (receipt of packets and putting them in right order)
IRC
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
TFTP - Trivial File Transfer Protocol

34. TCP is a ________________ layer protocol.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It Doesn't - TCP does
Packet
Transport

35. Encapsulation occurs at all - some or none of the layers of the OSI model?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
All

36. List three network applications that use TCP
Web browsing - email - file transfer
All
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

37. Which protocol ensures more reliable delivery between applications - TCP or UDP?
It works the same on all Layer 1 media
TCP. It makes larger demands on a network
Destination network - next-hop - metric
Transport

38. UDP does or does not create a session?
Does not
It is the most common - and it encapsulates transport layer segments
Allows the transport layer function on the destination host to reassemble segments in the right order
Static routing

39. On a particular network how would you determine the default gateway address for a host?
TCP
The default gateway address is the address of a router interface that is connected to the same network as the host.
TCP. It makes larger demands on a network
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

40. What is contained in the header of each segment or datagram?
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
Routers (the subnetting process)
The source and destination port number
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

41. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Telnet
53

42. 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?
Routers (the subnetting process)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP
TCP uses flow control

43. TCP header provides for
Acknowledgment field significant
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
An alternate HTTP port
TCP

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

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45. 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)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FIN
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
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

46. Which is a connection-oriented protocol - TCP or UDP?
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Reliable - connection-oriented protocol (resends if not received)
TCP

47. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Synchronize sequence numbers

48. Which of the following are true about static and dynamic routing?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)
Not - these are done by other protocols in other layers
Data link - physical

49. Which of the following is true about IP?

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50. Which of the following are not functions of the network layer?
User Datagram Protocol
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
Netstat -r and route print
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts