CCNA RS

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1. Which of the following OSI reference model layers do not have a direct mapping on the TCP/IP model?

Session

Presentation

Transport

Network

Question 1 of 50

2. What are the three functions of the network layer in the OSI reference model?

Defines how devices forward packets

Defines how devices can have an address that can be used by the routing process

Defines path determination done by the routing protocols to choose the best route

Defines when a device can send data over a transmission medium

Question 2 of 50

3. Which protocols are present at the Transport layer?

ICMP

UDP

TCP

DNS

Question 3 of 50

4. In the TCP/IP model, what is the encapsulated data at the transport layer called?

Packet

Segment

Frame

Section

Question 4 of 50

5. What is the correct order for the ethernet header and trailer fields?

Preamble, Start Frame Delimiter, Type, Data, Destination MAC, Source MAC, Frame Check Sequence

Preamble, Start Frame Delimiter, Type, Destination MAC, Source MAC, Data, Frame Check Sequence

Preamble, Start Frame Delimiter, Source MAC, Destination MAC, Type, Data, Frame Check Sequence

Preamble, Start Frame Delimiter, Destination MAC, Source MAC, Type, Data, Frame Check Sequence

Question 5 of 50

6. What is the purpose of the Frame Check Sequence field in an Ethernet frame?

Calculates the hash value of the Destination MAC and Source MAC fields from the Ethernet frame

Calculates the hash value of the Data field from the Ethernet frame

Provides a method for the Ethernet frame’s receiving device to check whether there were transmission errors that altered the content of the frame

There is no such Frame Check Sequence field in an Ethernet frame

Question 6 of 50

7. Which type of address indicates that traffic will be sent to a subset of all devices on the Ethernet LAN?

Multicast address

Broadcast address

Anycast address

Unicast address

Question 7 of 50

8. What is the minimum size of the data field of an Ethernet frame?

There is no minimum size

64 bytes

46 bytes

1024 bytes

Question 8 of 50

9. Assuming the connections between the router, the switch, and the host are Ethernet, what are the types of Ethernet cables needed to connect these three devices?

cabling

Straight cable between ROUTER and SWITCH and crossover cable between SWITCH and HOST

Straight cable between ROUTER and SWITCH and straight cable between SWITCH and HOST

Crossover cable between ROUTER and SWITCH and crossover cable between SWITCH and HOST

Crossover cable between ROUTER and SWITCH and straight cable between SWITCH and HOST

Question 9 of 50

10. Of the tables below, which shows the correct order of the seven layers of the OSI model?

OSI

Question 10 of 50

11. What is the correct order of the standard HDLC packet fields?

Flag, Control, Address Data, FCS

Flag, Address, Control, Data, FCS

Address, Flag, Data, Control, FCS

Address, Control, Data, Flag, FCS

Question 11 of 50

12. Which is the HDLC header added by the Cisco proprietary implementation of HDLC?

Flag

Control

Type

Identifier

Question 12 of 50

13. Which one(s) of these following examples are Internet Access Links?

Leased Line

HDLC

DSL

Cable

Question 13 of 50

14. What does Ethernet over MPLS(EoMPLS) provide?

Speeds of up to 10 Mbps between two devices

A point-to-point connection between two devices

An Ethernet segment emulation between two devices

Data confidentiality and encryption between two devices

Question 14 of 50

15. Assuming the below packet is a Cisco HDLC packet, what field is missing from the packet?

hdlc_cisco

Start Frame Delimiter

Padding

Control

Source Address

Question 15 of 50

16. What is the purpose of Address Resolution Protocol?

To identify the next-hop interface

To dynamically learn the data link address of an IP host connected to an Ethernet link

To find the corresponding IP address of a MAC address

To find the DLCI of a PVC in a Frame-Relay network

Question 16 of 50

17. What is the size of an IPv4 address?

64 bits

16 bits

32 bits

24 bits

Question 17 of 50

18. Which of the following IP addresses falls into a class B network?

172.172.172.1/16

200.200.200.1/24

150.150.150.1/16

20.20.20.1/8

Question 18 of 50

19. What is a valid network numbers range for class C?

128.0.0.0 to 172.255.0.0

128.0.0.0 to 191.255.0.0

192.0.0.0 to 239.255.255.0

192.0.0.0 to 223.255.255.0

Question 19 of 50

20. What is the purpose of IP subnetting?

Defines a flexible method to take a single Class A, B, or C IP network and further subdivide it into smaller groups of consecutive IP addresses

Defines a method to consolidate multiple consecutive subnets into a single network

Defines a method to increase the number of possible hosts on a network

Defines a method to increase the size of the broadcast domain in an Ethernet segment

Question 20 of 50

21. Which of the following tables contain the correct valid network numbers for Class A, B, and C?

class

Question 21 of 50

22. What is the two-step logic that a host uses to send a packet?

If the destination IP address is in the same IP subnet as the host, send the packet directly to that destination host

If the destination IP address is in the same IP subnet as the host, send the packet to the default gateway

If the destination IP address is not in the same IP subnet as the host, send the packet to the default gateway

If the destination IP address is not in the same IP subnet as the host, drop the packet

Question 22 of 50

23. What does a router do with a packet whose destination data link address does not belong to the router?

The router changes the data link destination address and processes the packet

The router sends the packet back to the source

The router forwards the packet to its destination

The router drops the packet

Question 23 of 50

24. What are two of the steps a router takes when it receives a packet whose destination data link address is the router?

Forwards the packet as it is

Changes the source IP address of the packet with its own IP address and then forwards the packet

Compares the IP packet’s destination IP address to the routing table and finds the route that best matches the destination address

Discards the old data link header and trailer, leaving the IP packet

Question 24 of 50

25. What are two of the goals of a routing protocol?

To dynamically learn and fill the routing table with a route to each subnet in the network

To increase the router CPU load due to the computing needed to calculate the best possible routes

To place the best route in the routing table If more than one route to a subnet is available

To fill up the router memory with the routes for each subnet in the network

Question 25 of 50

26. What are two of the goals of a routing protocol?

To remove the routes that are in the routing table for more than 24 hours

To remove the routes for which there aren’t at least two possible next-hops

To prevent routing loops

To notice when routes in the table are no longer valid and to remove them from the routing table; if another route through another neighboring router is available, to add the route to the routing table

Question 26 of 50

27. Which two statements are true with regards to ARP Request and ARP Reply?

ARP Reply destination MAC address is broadcast

ARP Reply destination MAC address is unicast

ARP Request destination MAC address is broadcast

ARP Request destination MAC address is unicast

Question 27 of 50

28. Which of the following is not a function of the TCP/IP Transport layer?

Flow control using windowing

IP packets fragmentation

Ordered data transfer and data segmentation

Connection establishment and termination

Question 28 of 50

29. The message created by TCP that begins with the TCP header, followed by any application data, is called?

TCP frame

TCP stream

TCP segment

TCP flow

Question 29 of 50

30. Which of the following is not a component of a socket?

An IP address

A transport protocol

A MAC address

A port number

Question 30 of 50

31. What is the transport protocol and the port number of a www application?

TCP, port 80

TCP, port 21

UDP, port 80

UDP, port 21

Question 31 of 50

32. Which of the following tables contain the correct port number/protocol/application combinations?

app_ports

Question 32 of 50

33. What is the correct order of the packets required to establish a TCP connection?

SYN, ACK

SYN, SYN+ACK, ACK

SYN, ACK, ESTABLISH

SYN, ESTABLISH

Question 33 of 50

34. Looking at the diagram below, what should be the last packet exchanged before the TCP connection can be established?

tcp_establishment

ESTABLISH, DP=80, SP=3000

FIN, DP=80, SP=3000

ACK, DP=80, SP=3000

CLOSE, DP=80, SP=3000

Question 34 of 50

35. The primary function of a switch is to forward frames. What is the parameter a switch uses to decide where to forward a frame?

The source IP address

The destination MAC address

The destination IP address

The source MAC address

Question 35 of 50

36. How does a switch populate its MAC address table?

By learning the source IP address of each frame received

By learning the destination MAC address of each frame received

By learning the source MAC address of each frame received

By learning the destination IP address of each frame received

Question 36 of 50

37. What kind of frames are flooded by a switch?

Unknown unicast frames

Broadcast frames

Multicast frames

Known unicast frames

Question 37 of 50

38. What does a switch do with a frame whose destination MAC address is not in the MAC address table?

It sends the frame on all interfaces

It sends the frame on all interfaces except the one from where it came

It drops the frame

It stores the frame until the destination MAC address is learned

Question 38 of 50

39. Considering the diagram and the MAC address table of the switch below, on which interface will the switch forward a frame that is coming from PC2 and is destined for MAC address 3333.3333.3333?

forward_known

Gi0/1

Gi0/2

Gi0/3

Gi0/4

Question 39 of 50

40. Considering the diagram and the MAC address table of the switch below, on which interface will the switch forward a frame that is coming from PC1 and is destined for MAC address 4444.4444.4444?

forward_unknown

Gi0/1

Gi0/2

Gi0/3

Gi0/4

Question 40 of 50

41. The type of forwarding that occurs when a switch starts to forward the frame after the first 64 bytes of the frame is called?

Store-and-forward

Cut-through

Fragment-free

Rapid-forward

Question 41 of 50

42. What is the disadvantage of using the cut-through forwarding method?

The latency increases

The method does not allow the switch to discard the frames that fail the FCS check

The method doesn’t work when the switch is using speeds higher than 10 Gbps

The method doesn’t work when the switch is using speeds higher than 1 Gbps

Question 42 of 50

43. What is the purpose of Spanning Tree Protocol?

To increase the number of the active paths that can exist between any pair of LAN segments

To prevent looping frames by not forwarding the broadcast and unknown unicast frames

To prevent looping frames by blocking some ports from forwarding frames so that only one active path exists between any pair of LAN segments

To prevent looping frames by forwarding only known unicast frames

Question 43 of 50

44. In what way is a switch different from a hub?

The switch decreases the number of the broadcast domains

The switch tracks the MAC addresses of the devices

The switch doesn’t allow devices with different Ethernet speeds to communicate through the switch

The switch doesn’t support full-duplex communication

Question 44 of 50

45. What device will increase the number of the broadcast domains?

A bridge

A hub

A switch

A router

Question 45 of 50

46. Which of the following doesn’t create multiple collision domains?

A switch

A router

A hub

A bridge

Question 46 of 50

47. How can a switch be made to create multiple broadcast domains?

By putting some interfaces in one VLAN and other interfaces in another VLAN

By not forwarding broadcast frames

By enabling Spanning Tree Protocol

By being able to support full-duplex communication

Question 47 of 50

48. Which two of the following statements are true?

A collision domain is a set of NICs for which a broadcast frame sent by one NIC is received by all other NICs in the same collision domain

A collision domain is a set of NICs for which a frame sent by one NIC could result in a collision with a frame sent by any other NIC in the same collision domain

A broadcast domain is a set of NICs for which a broadcast frame sent by one NIC is received by all other NICs in the same broadcast domain

A broadcast domain is a set of NICs for which a frame sent by one NIC could result in a collision with a frame sent by any other NIC in the same broadcast domain

Question 48 of 50

49. How many broadcast domains should be present in the below diagram?

broadcast_domains