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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 two commands can be used to view a host's routing table?
Netstat -r and route print
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Connectionless - Best effort (unreliable) - media independent

2. ACK is?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Acknowledgment field significant
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.
An alternate HTTP port

3. How many bits are in an IPv4 address?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Routing table
32 - there are four octets of 8 bits each in an IPv4 address
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

4. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
False. It's like a file - only one process can read/write.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Acknowledgment field significant
Not - these are done by other protocols in other layers

5. Encapsulation occurs at all - some or none of the layers of the OSI model?
Web browsing - email - file transfer
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
All

6. Port 23 is?
Destination network - next-hop - metric
Telnet
TCP. It makes larger demands on a network
Allows the transport layer function on the destination host to reassemble segments in the right order

7. Name the private address blocks
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It is the most common - and it encapsulates transport layer segments
User Datagram Protocol

8. What is the port range for Registered ports
Decapsulation
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
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

9. Port 520 is?
TFTP - Trivial File Transfer Protocol
RIP (Routing Information Protocol)
49152 - 65535.
Destination network - next-hop - metric

10. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
FTP
TCP
To track the different conversations crossing the network at the same time

11. During data transfer - What is the receiving host responsible for?
Window size
FIN
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

12. What is the port range for well known ports
Destination network - next-hop - metric
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
UDP - it sends datagrams as 'best effort'

13. What is a broadcast domain?
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.
UDP - it sends datagrams as 'best effort'
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

14. Why is IP 'media independent'?
Data link - physical
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

15. In networking terms - What is reliability?
Routers (the subnetting process)
It means ensuring that each segment that the source sends arrives at the destination
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Dynamic / private

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?
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.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Static routing
IRC

17. 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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Telnet
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

18. Which of the following are not functions of the network layer?
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
Upper
DNS - video-streaming - VoIP
Telnet

19. Port 194 is?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
IRC
Netstat -r and route print
Synchronize sequence numbers

20. IP is designed or not designed to track and manage the flow of packets?
Reliable - connection-oriented protocol (resends if not received)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Not - these are done by other protocols in other layers
User Datagram Protocol

21. What is the purpose of sequence numbers?
Packet
Connectionless
Decapsulation
Allows the transport layer function on the destination host to reassemble segments in the right order

22. What is the proper order of FIN sequence?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

23. Pieces of information about a route that a routing table contains
Decapsulation
All
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Connectionless - Best effort (unreliable) - media independent

24. Port 8080 is?
Ephermeral
An alternate HTTP port
Destination network - next-hop - metric
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

25. Port 110 is?
Destination network - next-hop - metric
Connectionless
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
POP3

26. MSN messenger uses TCP or UDP?
32 - there are four octets of 8 bits each in an IPv4 address
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TCP
IRC

27. Port 20 is?
Routers (the subnetting process)
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
FTP
Does not

28. 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?
An alternate HTTP port
It works the same on all Layer 1 media
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
TCP uses flow control

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

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30. Why does TCP use a sequence number in the header?
To track the different conversations crossing the network at the same time
Netstat -r and route print
Telnet
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

31. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
1
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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.

32. Port 443 is?
RIP (Routing Information Protocol)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
HTTPS (Secure HTTP)
Not - these are done by other protocols in other layers

33. UDP stands for?
128
HTTPS (Secure HTTP)
Dynamic / private
User Datagram Protocol

34. Port 25 is?
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
SMTP
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
53

35. The three-way handshake performs what three functions?
TCP
49152 - 65535.
Reliable - connection-oriented protocol (resends if not received)
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

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

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37. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
TCP. It makes larger demands on a network
Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

38. How many bits are in an IPv6 address?
128
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

39. What kinds of problems are caused by excessive broadcast traffic on a network segment?
1
HTTPS (Secure HTTP)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

40. 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)
FIN
It means ensuring that each segment that the source sends arrives at the destination
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
RIP (Routing Information Protocol)

41. What is the protocol number for UDP?
TFTP - Trivial File Transfer Protocol
DNS - video-streaming - VoIP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
POP3

42. Which is a connectionless protocol - UDP or TCP?
UDP
128
Decapsulation
FTP

43. IP requires that each sending and receiving device have a __________ IP address.
Unique
IRC
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Connectionless - Best effort (unreliable) - media independent

44. What are three key factors to consider when grouping hosts into a common network?
Not - these are done by other protocols in other layers
Purpose - ownership - and geographic location are key ways to divide a network
It means ensuring that each segment that the source sends arrives at the destination
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

45. MTU stands for ?
Does not
Maximum transmission unit
Static routing
DNS - video-streaming - VoIP

46. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Does not
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
An alternate HTTP port
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

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

48. SYN is?
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
Synchronize sequence numbers
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Acknowledgment and reassembly (receipt of packets and putting them in right order)

49. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
DNS - video-streaming - VoIP
IRC
It Doesn't - TCP does
Connectionless

50. What is contained in the header of each segment or datagram?
The source and destination port number
Destination network - next-hop - metric
Packet
Purpose - ownership - and geographic location are key ways to divide a network