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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. The three-way handshake performs what three functions?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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)
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.

2. UDP stands for?
User Datagram Protocol
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
128

3. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
User Datagram Protocol
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless

4. What is the default DNS port number?
53
TCP. It makes larger demands on a network
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

5. Dynamic ports fall into what category of port
Transport
Purpose - ownership - and geographic location are key ways to divide a network
Packet
Ephermeral

6. Port 69 is?
Decapsulation
TFTP - Trivial File Transfer Protocol
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

7. Are well known ports registered
Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
53
49152 - 65535.

8. Port 20 is?
TCP uses flow control
FTP
20 and 8
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

9. 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
Does not
Routing table
TCP uses flow control

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

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11. Which protocol ensures more reliable delivery between applications - TCP or UDP?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
TCP. It makes larger demands on a network
Routing table
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

12. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Maximum transmission unit
1

13. UDP does or does not create a session?
Allows the transport layer function on the destination host to reassemble segments in the right order
32 - there are four octets of 8 bits each in an IPv4 address
Purpose - ownership - and geographic location are key ways to divide a network
Does not

14. Port 25 is?
Static routing
Decapsulation
SMTP
Gateway

15. Which is a connection-oriented protocol - TCP or UDP?
TCP
1
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)

16. Port 520 is?
Web browsing - email - file transfer
It is the most common - and it encapsulates transport layer segments
RIP (Routing Information Protocol)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

17. IP requires that each sending and receiving device have a __________ IP address.
The source and destination port number
Unique
32 - there are four octets of 8 bits each in an IPv4 address
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

18. The three main features of routes in a routing table are?
TCP
Window size
Unique
Destination network - next-hop - metric

19. What two commands can be used to view a host's routing table?
Connectionless - Best effort (unreliable) - media independent
Netstat -r and route print
RIP (Routing Information Protocol)
False. It's like a file - only one process can read/write.

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

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

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22. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It Doesn't - TCP does
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Routing table

23. What is the port range for well known ports
TCP
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

24. List three network applications that use TCP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Web browsing - email - file transfer
53
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. 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
SMTP
Transport
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

26. In networking terms - What is reliability?
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
UDP - it sends datagrams as 'best effort'
Reliable - connection-oriented protocol (resends if not received)
It means ensuring that each segment that the source sends arrives at the destination

27. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Acknowledgment field significant
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
RIP (Routing Information Protocol)
Reliable - connection-oriented protocol (resends if not received)

28. MSN messenger uses TCP or UDP?
Telnet
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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.

29. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Data link - physical
Not - these are done by other protocols in other layers
Window size
20 and 8

30. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
20 and 8
HTTPS (Secure HTTP)
1

31. Port 110 is?
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
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
POP3
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

32. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
HTTPS (Secure HTTP)
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
Window size

33. 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.
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
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
Data link - physical
FTP

34. What is the purpose of the ToS field in the IPv4 header?
SMTP
Packet
UDP - it sends datagrams as 'best effort'
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.

35. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
HTTPS (Secure HTTP)
It works the same on all Layer 1 media
FTP
Connectionless

36. What is the proper order of SYN sequence?
FTP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Acknowledgment field significant
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

37. Name the private address blocks
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.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the 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
Connectionless

38. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
Not - these are done by other protocols in other layers
UDP - it sends datagrams as 'best effort'
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

39. Which of the following are not functions of the network layer?
Not - these are done by other protocols in other layers
Transport
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
TCP. It makes larger demands on a network

40. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
SMTP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Routers (the subnetting process)

41. What is the port range for dynamic or private ports
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
49152 - 65535.
TCP uses flow control
False. It's like a file - only one process can read/write.

42. Why is IP 'media independent'?
Static routing
It is the most common - and it encapsulates transport layer segments
It works the same on all Layer 1 media
Netstat -r and route print

43. Which is a connectionless protocol - UDP or TCP?
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
UDP
TCP
TCP

44. List three network applications that use UDP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP uses flow control
DNS - video-streaming - VoIP
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

45. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Decapsulation
UDP - it sends datagrams as 'best effort'
Routing table

46. SYN is?
Window size
Transport
53
Synchronize sequence numbers

47. Port 194 is?
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.
IRC
UDP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

48. Routers add routes for the connected networks to their ________________ .
Purpose - ownership - and geographic location are key ways to divide a network
Routing table
Synchronize sequence numbers
Static routing

49. How many bits are in an IPv6 address?
FTP
TCP
128
The source and destination port number

50. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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
20 and 8