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WorksheetsСеть 3
Total questions: 37
Worksheet time: 6hrs 10mins
What statement describes a characteristic of MAC addresses?
They must be globally unique.
They are only routable within the private network.
They are added as part of a Layer 3 PDU.
They have a 32-bit binary value.
What is the special value assigned to the first 24 bits of a multicast MAC address transporting an IPv4 packet?
01-5E-00
FF-00-5E
FF-FF-FF
01-00-5E
What will a host on an Ethernet network do if it receives a frame with a unicast destination MAC address that does not match its own MAC address?
It will discard the frame.
It will forward the frame to the next host.
It will remove the frame from the media.
It will strip off the data-link frame to check the destination IP address.
Which network device makes forwarding decisions based on the destination MAC address that is contained in the frame?
Repeater
Hub
Switch
Router
Which network device has the primary function to send data to a specific destination based on the information found in the MAC address table?
Hub
Router
Switch
Modem
Which function or operation is performed by the LLC sublayer?
It performs data encapsulation.
It communicates with upper protocol layers.
It is responsible for media access control.
It adds a header and trailer to a packet to form an OSI Layer 2 PDU.
What happens to runt frames received by a Cisco Ethernet switch?
The frame is dropped.
The frame is returned to the originating network device.
The frame is broadcast to all other devices on the same network.
The frame is sent to the default gateway.
What addressing information is recorded by a switch to build its MAC address table?
The destination Layer 3 address of incoming packets
The destination Layer 2 address of outgoing frames
The source Layer 3 address of outgoing packets
The source Layer 2 address of incoming frames
What is auto-MDIX?
A type of Cisco switch
An Ethernet connector type
A feature to automatically determine speed and duplex
A feature that detects Ethernet cable type
What type of address is 01-00-5E-0A-00-02?
An address that reaches every host inside a local subnet
An address that reaches one specific host
An address that reaches every host in the network
An address that reaches a specific group of hosts
Which statement is true about MAC addresses?
MAC addresses are implemented by software.
A NIC only needs a MAC address if connected to a WAN.
The first three bytes are used by the vendor assigned OUI.
The ISO is responsible for MAC addresses regulations.
Which command can be used on a Windows host to display the routing table?
netstat -s
show ip route
netstat -r
tracert
What information is added during encapsulation at OSI Layer 3?
Source and destination MAC
Source and destination application protocol
Source and destination port number
Source and destination IP address
How does the network layer use the MTU value?
The network layer depends on the higher level layers to determine the MTU.
The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it.
The MTU is passed to the network layer by the data link layer.
To increase speed of delivery, the network layer ignores the MTU.
Which characteristic describes an IPv6 enhancement over IPv4?
IPv6 addresses are based on 128-bit flat addressing as opposed to IPv4 which is based on 32-bit hierarchical addressing.
The IPv6 header is simpler than the IPv4 header is, which improves packet handling.
Both IPv4 and IPv6 support authentication, but only IPv6 supports privacy capabilities.
The IPv6 address space is four times bigger than the IPv4 address space.
Which statement accurately describes a characteristic of IPv4?
All IPv4 addresses are assignable to hosts.
IPv4 has a 32-bit address space.
An IPv4 header has fewer fields than an IPv6 header has.
IPv4 natively supports IPsec.
When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?
Destination MAC address
Source IP address
Destination IP address
Source MAC address
A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?
The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.
The packet will be sent directly to the destination host.
The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.
The packet will be sent only to the default gateway.
Which IPv4 address can a host use to ping the loopback interface?
126.0.0.1
127.0.0.0
126.0.0.0
127.0.0.1
When a connectionless protocol is in use at a lower layer of the OSI model, how is missing data detected and retransmitted if necessary?
Connectionless acknowledgements are used to request retransmission.
Upper-layer connection-oriented protocols keep track of the data received and can request retransmission from the upper-level protocols on the sending host.
Network layer IP protocols manage the communication sessions if connection-oriented transport services are not available.
The best-effort delivery process guarantees that all packets that are sent are received.
What was the reason for the creation and implementation of IPv6?
To make reading a 32-bit address easier
To relieve IPv4 address depletion
To provide more address space in the Internet Names Registry
To allow NAT support for private addressing
Which information is used by routers to forward a data packet toward its destination?
Source IP address
Destination IP address
Source data-link address
Destination data-link address
Which field in an IPv4 packet header will typically stay the same during its transmission?
Flag
Time-to-Live
Packet Length
Destination Address
Which field in an IPv6 packet is used by the router to determine if a packet has expired and should be dropped?
TTL
Hop Limit
Address Unreachable
No Route to Destination
Which router component holds the routing table, ARP cache, and running configuration file?
ROM
Flash
RAM
NVRAM
What type of information is contained in an ARP table?
Routes to reach destination networks
Switch ports associated with destination MAC addresses
Domain name to IPv4 address mappings
IPv4 address to MAC address mappings
A PC is configured to obtain an IPv4 address automatically from network 192.168.1.0/24. The network administrator issues the arp -a command and notices an entry of 192.168.1.255 ff-ff-ff-ff-ff-ff. Which statement describes this entry?
This is a dynamic map entry.
This entry maps to the default gateway.
This is a static map entry.
This entry refers to the PC itself.
A cybersecurity analyst believes an attacker is spoofing the MAC address of the default gateway to perform a man-in-the-middle attack. Which command should the analyst use to view the MAC address a host is using to reach the default gateway?
netstat -r
ipconfig /all
route print
arp -a
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table?
It broadcasts the frame out of all ports on the switch.
It notifies the sending host that the frame cannot be delivered.
It forwards the frame out of all ports except for the port at which the frame was received
It initiates an ARP request.
How does the ARP process use an IPv4 address?
To determine the MAC address of a device on the same network
To determine the network number based on the number of bits in the IPv4 address
To determine the amount of time a packet takes when traveling from source to destination
To determine the MAC address of the remote destination host
What is one function of the ARP protocol?
Resolving an IPv4 address to a MAC address
Mapping a domain name to its IP address
Maintaining a table of domain names with their resolved IP addresses
Obtaining an IPv4 address automatically
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?
It sends the frame to all ports.
It sends the frame to all ports that are registered to forward broadcasts.
It sends the frame to all ports except the port on which it received the frame.
It drops the frame.
What addresses are mapped by ARP?
IPv4 address to a destination MAC address
Destination IPv4 address to the source MAC address
Destination IPv4 address to the destination host name
Destination MAC address to the source IPv4 address
When an IPv4 packet is sent to a host on a remote network, what information is provided by ARP?
The MAC address of the router interface closest to the sending host
The MAC address of the switch port that connects to the sending host
The IPv4 address of the default gateway
The IPv4 address of the destination host
The ARP table in a switch maps which two types of address together?
Layer 2 address to a Layer 4 address
Layer 3 address to a Layer 4 address
Layer 3 address to a Layer 2 address
Layer 4 address to a Layer 2 address
What is the purpose of ARP in an IPv4 network?
To forward data onward based on the destination IP address
To build the MAC address table in a switch from the information that is gathered
To obtain a specific MAC address when an IP address is known
To forward data onward based on the destination MAC address.
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF
255.255.255.255
127.0.0.1
0.0.0.0
01-00-5E-00-AA-23
