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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. What is a broadcast domain?
Connectionless
Unique
128
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

2. Dynamic ports fall into what category of port
DNS - video-streaming - VoIP
Ephermeral
Routing table
Purpose - ownership - and geographic location are key ways to divide a network

3. Encapsulation occurs at all - some or none of the layers of the OSI model?
DNS - video-streaming - VoIP
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.
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
All

4. The three-way handshake performs what three functions?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
Allows the transport layer function on the destination host to reassemble segments in the right order
Packet

5. Routers add routes for the connected networks to their ________________ .
Window size
UDP - it sends datagrams as 'best effort'
Netstat -r and route print
Routing table

6. 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.
Data link - physical
Netstat -r and route print
TCP uses flow control
User Datagram Protocol

7. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
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
Data link - physical
Does not

8. How many bits are in an IPv6 address?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Gateway
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
128

9. What is the port range for dynamic or private ports
Not - these are done by other protocols in other layers
Maximum transmission unit
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
49152 - 65535.

10. List three network applications that use TCP
Static routing
Web browsing - email - file transfer
1
Packet

11. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
49152 - 65535.
Telnet
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

12. Port 69 is?
Acknowledgment field significant
UDP
TFTP - Trivial File Transfer Protocol
Upper

13. During data transfer - What is the receiving host responsible for?
It works the same on all Layer 1 media
Acknowledgment and reassembly (receipt of packets and putting them in right order)
DNS - video-streaming - VoIP
RIP (Routing Information Protocol)

14. Pieces of information about a route that a routing table contains
Routers (the subnetting process)
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
49152 - 65535.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

15. Which is a connection-oriented protocol - TCP or UDP?
UDP - it sends datagrams as 'best effort'
TCP
Destination network - next-hop - metric
Decapsulation

16. 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)
Netstat -r and route print
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP uses flow control

17. UDP does or does not create a session?
Does not
Maximum transmission unit
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
Connectionless

18. What is the port range for Registered ports
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Synchronize sequence numbers
FIN

19. What is the purpose of the ToS field in the IPv4 header?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Allows the transport layer function on the destination host to reassemble segments in the right order
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.
Ephermeral

20. ACK is?
Decapsulation
Unique
HTTPS (Secure HTTP)
Acknowledgment field significant

21. List three network applications that use UDP
DNS - video-streaming - VoIP
Reliable - connection-oriented protocol (resends if not received)
Not - these are done by other protocols in other layers
Purpose - ownership - and geographic location are key ways to divide a network

22. Why does TCP use a sequence number in the 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
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
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.
HTTPS (Secure HTTP)

23. UDP stands for?
User Datagram Protocol
UDP
Connectionless
Reliable - connection-oriented protocol (resends if not received)

24. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
RIP (Routing Information Protocol)
Web browsing - email - file transfer
128
Routers (the subnetting process)

25. TCP header provides for
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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.
TCP

26. What two commands can be used to view a host's routing table?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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.
Netstat -r and route print

27. On a particular network how would you determine the default gateway address for a host?
Window size
UDP - it sends datagrams as 'best effort'
49152 - 65535.
The default gateway address is the address of a router interface that is connected to the same network as the host.

28. 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
FTP
POP3
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

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

30. What are three key factors to consider when grouping hosts into a common network?
Maximum transmission unit
Purpose - ownership - and geographic location are key ways to divide a network
128
It means ensuring that each segment that the source sends arrives at the destination

31. IP requires that each sending and receiving device have a __________ IP address.
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.
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
An alternate HTTP port
Unique

32. What is the proper order of SYN sequence?
Source and destination (ports) - Sequencing - Acknowledgement - 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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

33. How many bits are in an IPv4 address?
To track the different conversations crossing the network at the same time
32 - there are four octets of 8 bits each in an IPv4 address
POP3
Window size

34. Port 25 is?
Synchronize sequence numbers
SMTP
Ephermeral
Web browsing - email - file transfer

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

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36. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
128
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

37. What is the proper order of FIN sequence?
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.
Dynamic / private
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)

38. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Reliable - connection-oriented protocol (resends if not received)
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
TCP. It makes larger demands on a network
Gateway

39. Port 110 is?
POP3
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
Reliable - connection-oriented protocol (resends if not received)

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

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41. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
RIP (Routing Information Protocol)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

42. Which protocol ensures more reliable delivery between applications - TCP or UDP?
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
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 makes larger demands on a network
Routers (the subnetting process)

43. Name the private address blocks
Telnet
1
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
20 and 8

44. 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)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It is the most common - and it encapsulates transport layer segments
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
FIN

45. 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?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
1
TCP uses flow control

46. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
User Datagram Protocol
Source and destination (ports) - Sequencing - Acknowledgement - 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
Forward the packet to the default route interface (gateway) or just drop/discard the packets

47. Port 443 is?
1
The default gateway address is the address of a router interface that is connected to the same network as the host.
HTTPS (Secure HTTP)
Connectionless

48. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
UDP - it sends datagrams as 'best effort'
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Connectionless

49. Which of the following are true about IP?
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 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)
SMTP

50. What are the transport layer's responsibilities?
FTP
Purpose - ownership - and geographic location are key ways to divide a network
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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