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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. Dynamic ports fall into what category of port
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Unique
Transport
Ephermeral

2. 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.
Unique
IRC
Netstat -r and route print

3. List three network applications that use TCP
Web browsing - email - file transfer
False. It's like a file - only one process can read/write.
Connectionless
DNS - video-streaming - VoIP

4. What is the default DNS port number?
FTP
53
False. It's like a file - only one process can read/write.
It is the most common - and it encapsulates transport layer segments

5. Port 520 is?
Packet
Routing table
RIP (Routing Information Protocol)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

6. SYN is?
It works the same on all Layer 1 media
Synchronize sequence numbers
Reliable - connection-oriented protocol (resends if not received)
Packet

7. What are three key factors to consider when grouping hosts into a common network?
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
TCP
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.
Purpose - ownership - and geographic location are key ways to divide a network

8. What is the netstat utility used for on a host?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
To track the different conversations crossing the network at the same time
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
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

9. During data transfer - What is the receiving host responsible for?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
User Datagram Protocol
Acknowledgment and reassembly (receipt of packets and putting them in right order)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

10. 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
Static routing
Dynamic / private
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

11. What is a broadcast domain?
TCP uses flow control
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
DNS - video-streaming - VoIP
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

12. What is the port range for well known ports
Synchronize sequence numbers
Decapsulation
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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.

13. 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?
TCP uses flow control
1
FTP
DNS - video-streaming - VoIP

14. The router a network uses to send and receive messages beyond the network is called a ___________ router.
TCP uses flow control
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Gateway
The source and destination port number

15. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
It Doesn't - TCP does
POP3

16. TCP is a ________________ layer protocol.
User Datagram Protocol
Transport
Not - these are done by other protocols in other layers
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

17. Which of the following is true about IP?

18. UDP does or does not create a session?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Does not
Static routing

19. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
It works the same on all Layer 1 media
Netstat -r and route print
DNS - video-streaming - VoIP
Forward the packet to the default route interface (gateway) or just drop/discard the packets

20. IP is designed or not designed to track and manage the flow of packets?
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.
Purpose - ownership - and geographic location are key ways to divide a network
Upper
Not - these are done by other protocols in other layers

21. 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?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Static routing
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.
Purpose - ownership - and geographic location are key ways to divide a network

22. Which of the following are true about static and dynamic routing?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Window size
20 and 8

23. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Ephermeral
Reliable - connection-oriented protocol (resends if not received)
128
Telnet

24. What are the transport layer's responsibilities?
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
IRC
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

25. Port 443 is?
Connectionless
HTTPS (Secure HTTP)
Dynamic / private
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

26. 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
Purpose - ownership - and geographic location are key ways to divide a network
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
Routing table

27. Port 25 is?
Not - these are done by other protocols in other layers
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
SMTP
It works the same on all Layer 1 media

28. Port 23 is?
1
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

29. IP requires that each sending and receiving device have a __________ IP address.
Unique
FIN
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Connectionless

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

31. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

32. UDP stands for?
Ephermeral
Packet
TCP
User Datagram Protocol

33. TCP header provides for
Upper
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP uses flow control
Data link - physical

34. What information does a router need to successfully forward packets?
TCP
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Window size

35. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
An alternate HTTP port
Upper

36. Port 20 is?
20 and 8
SMTP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FTP

37. What is the proper order of FIN sequence?
Connectionless
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
Routers (the subnetting process)

38. What is the protocol number for UDP?
TCP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It works the same on all Layer 1 media

39. What four tasks does the network layer perform?
It Doesn't - TCP does
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
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

40. ACK is?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Acknowledgment field significant
Reliable - connection-oriented protocol (resends if not received)
All

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

42. What is contained in the header of each segment or datagram?
The source and destination port number
An alternate HTTP port
Decapsulation
49152 - 65535.

43. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Upper
53
Web browsing - email - file transfer

44. Which of the following are not functions of the network layer?
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
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
Dynamic / private

45. How many bytes of overhead do TCP segments carry? How many does UDP carry?
TCP
20 and 8
IRC
Maximum transmission unit

46. Which is a connection-oriented protocol - TCP or UDP?
TCP
Purpose - ownership - and geographic location are key ways to divide a network
Connectionless - Best effort (unreliable) - media independent
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

47. 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.
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
Dynamic / private
Acknowledgment field significant

48. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Static routing
Decapsulation
Window size
Connectionless

49. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
Synchronize sequence numbers
Allows the transport layer function on the destination host to reassemble segments in the right order
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

50. Which is a connectionless protocol - UDP or TCP?
Acknowledgment field significant
UDP
Web browsing - email - file transfer
Purpose - ownership - and geographic location are key ways to divide a network