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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. Which of the following are true about TCP and IP?

2. 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?
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
Window size
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

3. Which of the following are not functions of the network layer?
Decapsulation
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)
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

4. Are well known ports registered
Packet
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

5. Port 8080 is?
Routing table
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
An alternate HTTP port
Static routing

6. Port 194 is?
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
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
Routers (the subnetting process)
IRC

7. 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
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
Not - these are done by other protocols in other layers
It means ensuring that each segment that the source sends arrives at the destination

8. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Reliable - connection-oriented protocol (resends if not received)
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.
Data link - physical

9. What is the port range for dynamic or private ports
49152 - 65535.
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 makes larger demands on a network
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

10. Port 520 is?
Reliable - connection-oriented protocol (resends if not received)
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
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.
RIP (Routing Information Protocol)

11. What are three key factors to consider when grouping hosts into a common network?
TFTP - Trivial File Transfer Protocol
Routing table
TCP uses flow control
Purpose - ownership - and geographic location are key ways to divide a network

12. What two commands can be used to view a host's routing table?
Not - these are done by other protocols in other layers
Netstat -r and route print
HTTPS (Secure HTTP)
FIN

13. What four tasks does the network layer perform?
TCP
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.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

14. List three network applications that use UDP
TFTP - Trivial File Transfer Protocol
Static routing
DNS - video-streaming - VoIP
Web browsing - email - file transfer

15. Dynamic ports fall into what category of port
Ephermeral
All
Maximum transmission unit
Forward the packet to the default route interface (gateway) or just drop/discard the packets

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

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

18. Why is IP 'media independent'?
It works the same on all Layer 1 media
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.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
49152 - 65535.

19. ACK is?
TCP. It makes larger demands on a network
TFTP - Trivial File Transfer Protocol
FIN
Acknowledgment field significant

20. 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?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Purpose - ownership - and geographic location are key ways to divide a network
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

21. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
Netstat -r and route print
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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

22. UDP does or does not create a session?
Does not
1
POP3
TFTP - Trivial File Transfer Protocol

23. 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
Not - these are done by other protocols in other layers
It means ensuring that each segment that the source sends arrives at the destination
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

24. On a particular network how would you determine the default gateway address for a host?
The default gateway address is the address of a router interface that is connected to the same network as the host.
False. It's like a file - only one process can read/write.
DNS - video-streaming - VoIP
UDP - it sends datagrams as 'best effort'

25. The router a network uses to send and receive messages beyond the network is called a ___________ router.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Gateway
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

26. 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.
It Doesn't - TCP does
Data link - physical
All
TCP uses flow control

27. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Does not
Connectionless - Best effort (unreliable) - media independent
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

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

29. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
The default gateway address is the address of a router interface that is connected to the same network as the host.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
HTTPS (Secure HTTP)

30. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
53
Netstat -r and route print

31. Which of the following is true about IP?

32. How many bits are in an IPv6 address?
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 and reassembly (receipt of packets and putting them in right order)
128
RIP (Routing Information Protocol)

33. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
The source and destination port number
Synchronize sequence numbers
Telnet

34. What is the proper order of SYN sequence?
TCP uses flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
FIN
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

35. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
TCP
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
Routing table

36. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TFTP - Trivial File Transfer Protocol

37. Port 110 is?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
IRC
POP3
128

38. Ephermeral port is what type of port
Static routing
Dynamic / private
Unique
UDP - it sends datagrams as 'best effort'

39. 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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

40. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Connectionless
Routers (the subnetting process)

41. Which is a connection-oriented protocol - TCP or UDP?
Synchronize sequence numbers
TCP
Acknowledgment field significant
Reliable - connection-oriented protocol (resends if not received)

42. Port 20 is?
It means ensuring that each segment that the source sends arrives at the destination
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Dynamic / private
FTP

43. Port 23 is?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Allows the transport layer function on the destination host to reassemble segments in the right order
Telnet
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

44. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Static routing
Packet

45. 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 means ensuring that each segment that the source sends arrives at the destination
Transport
Connectionless

46. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
SMTP
To track the different conversations crossing the network at the same time

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.
TCP
It is the most common - and it encapsulates transport layer segments
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

48. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
TFTP - Trivial File Transfer Protocol
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
Window size
Acknowledgment field significant

49. How many bits are in an IPv4 address?
Acknowledgment field significant
Netstat -r and route print
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

50. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Web browsing - email - file transfer
Forward the packet to the default route interface (gateway) or just drop/discard the packets
To track the different conversations crossing the network at the same time
Upper