IST 201 Intro to networking Chapter 9
Which destination address is used in an ARP request frame? 01-00-5E-00-AA-23 FFFF.FFFF.FFFF 127.0.0.1 0.0.0.0 255.255.255.255
FFFF.FFFF.FFFF The purpose of an ARP request is to find the MAC address of the destination host on an Ethernet LAN. The ARP process sends a Layer 2 broadcast to all devices on the Ethernet LAN. The frame contains the IP address of the destination and the broadcast MAC address, FFFF.FFFF.FFFF
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table? It notifies the sending host that the frame cannot be delivered. It broadcasts the frame out of all ports on the switch. It initiates an ARP request. It forwards the frame out of all ports except for the port at which the frame was received.
It forwards the frame out of all ports except for the port at which the frame was received. A layer 2 switch determines how to handle incoming frames by using its MAC address table. When an incoming frame contains a destination MAC address that is not in the table, the switch forwards the frame out all ports, except for the port on which it was received.
Which two ICMPv6 messages are used in to determine the MAC address of a known IPv6 address? Neighbor Advertisement Neighbor Solicitation Router Advertisement Router Solicitation
Neighbor Advertisement Neighbor Solicitation The two ICMPv6 messages used in determining the MAC address of a known IPv6 address are the neighbor solicitation and the neighbor advertisement
Where is the ARP table stored on a device? ROM flash NVRAM RAM
RAM The ARP table is cached temporarily in RAM
To what type of address are ICMPv6 neighbor solicitation messages sent? unicast multicast broadcast
multicast ICMPv6 neighbor solicitation messages are sent as a multicast
Which two ICMPv6 messages are used during the Ethernet MAC address resolution process? (Choose two.) neighbor solicitation echo request neighbor advertisement router advertisement router solicitation
neighbor solicitation neighbor advertisement IPv6 uses neighbor solicitation(NS) and neighbor advertisement (NA) ICMPv6 messages for MAC address resolution
What is one function of the ARP protocol? obtaining an IPv4 address automatically mapping a domain name to its IP address maintaining a table of domain names with their resolved IP addresses resolving an IPv4 address to a MAC address
resolving an IPv4 address to a MAC address The two main functions of the ARP protocol are to resolve an IPv4 address to a MAC address and to maintain an ARP table, which lists the resolved pairs of IPv4 address and MAC address. A device automatically obtains an IP address through DHCP. The functions of DNS including resolving( or mapping) a domain name with it IP address and maintaining a table for the domain name/ IP pairs
Which command could be used on a Cisco router to view its ARP table? arp -a arp -d show arp table show ip arp
show ip arp The command show ip arp is used on Cisco routers to view the APR table
When an IPv4 packet is sent to a host on a remote network, what information is provided by ARP? the IPv4 address of the destination host the MAC address of the router interface closest to the sending host the IPv4 address of the default gateway the MAC address of the switch port that connects to the sending host
the MAC address of the router interface closest to the sending host When a host sends an IPv4 packet to a destination on a different network, the Ethernet frame cannot be sent directly to the destination host because the host is not directly reachable on the same network. The Ethernet frame must be sent to another device known as the router or default gateway in order to forward the IPv4 packet. ARP is used to discover the MAC address of the router(or default gateway) and use it as the destination MAC address in the frame header
How does the ARP process use an 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 to determine the network number based on the number of bits in the IPv4 address to determine the MAC address of a device on the same network
to determine the MAC address of a device on the same network The ARP process is used to complete the necessary mapping of IPv4 and MAC addresses that are stored in the ARP table that is maintained by each node on a LAN. When the destination device is not on the same network as the source device, the MAC address of the Layer 3 device on the source network is discovered and added to the ARP table of the source node
What two protocols are used to determine the MAC address of a known destination device IP address (IPv4 and IPv6)? DHCP ARP DNS ND
ARP ND Address Resolution Protocol(ARP) is used to determine the device MAC address of a known destination device IPv4 address. Neighbor Discovery(ND) is used to determine the MAC address of a known destination device IPv6 address.
Which statement is true about ARP? An ARP cache cannot be manually deleted. ARP entries are cached permanently. ARP entries are cached temporarily.
ARP entries are cached temporarily.
What is an attack using ARP? ARP broadcasts ARP hopping attacks ARP poisoning ARP starvation
ARP poisoning Two security issues with ARP Requests are that ARP messages are sent as broadcasts and can be spoofed
What type of information is contained in an ARP table? IPv4 address to MAC address mappings domain name to IPv4 address mappings switch ports associated with destination MAC addresses routes to reach destination networks
IPsv4 address to MAC address mappings ARP tables are used to store mappings of IPv4 addresses to MAC addresses. When a network device needs to forward a packet, the device knows only the IPv4 address. To deliver the packet on an Ethernet network, a MAC address is needed. APR resolves the MAC address and stores it in an ARP table.
What addresses are mapped by ARP? destination MAC address to the source IPv4 address destination IPv4 address to the destination host name destination IPv4 address to the source MAC address IPv4 address to a destination MAC address
IPv4 address to a destination MAC address ARP, or the Address Resolution Protocol, works by mapping the IPv4 address to a destination MAC address. The host knows the destination IPv4 address and uses ARP to resolve the corresponding destination MAC address
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame? It sends the frame to all ports except the port on which it received the frame. It sends the frame to all ports. It sends the frame to all ports that are registered to forward broadcasts. It drops the frame.
It sends the frame to all ports except the port on which it received the frame. When a layer 2 switch receives a frame with a broadcast destination address, it floods the frame to all ports except the port on which it received the frame
The ARP table in a switch maps which two types of address together? Layer 2 address to a Layer 4 address Layer 4 address to a Layer 2 address Layer 3 address to a Layer 4 address Layer 3 address to a Layer 2 address
Layer 3 address to a Layer 2 address The switch ARP table keeps a mapping Layer 2 MAC addresses to Layer 3 IP addresses. These mappings can be learned by the switch dynamically through ARP or statically through manual configuration.
What two functions are provided by ARP? (Choose two.) Maintains a table of IPv4 address to domain names Maintains a table of IPv4 to MAC address mappings Maintains a table of IPv6 to MAC address mappings Resolves IPv4 addresses to domain names Resolves IPv4 addresses to MAC addresses Resolves IPv6 addresses to MAC addresses
Maintains a table of IPv4 to MAC address mappings Resolves IPv4 addresses to MAC addresses ARP has two primary fucntions: maintain a table of IPv4 to MAC address mappings and determine the MAC addresses of known IPv4 addresses.
Which router component holds the routing table, ARP cache, and running configuration file? Flash RAM ROM NVRAM
RAM The routing table, ARP cache, and running configuration file are stored in volatile RAM
Which two ICMPv6 messages are used in SLAAC? Neighbor Advertisement Neighbor Solicitation Router Advertisement Router Solicitation
Router Advertisement Router Solicitation The two ICMPv6 messages used in SLAAC are the router solicitation and the router advertisement
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 entry refers to the PC itself. This is a static map entry. This is a dynamic map entry. This entry maps to the default gateway.
The IPv4 address of 192.168.1.255 on 192.168.1.0/24 network is the broadcast address, which is statically mapped to ff-ff-ff-ff-ff-ff in the ARP table
What destination MAC address would be included in a frame sent from a source device to a destination device on the same local network? A broadcast MAC address of FF-FF-FF-FF-FF-FF. The MAC address of the destination device. The MAC address of the local router interface.
The MAC address of the destination device. When sending a frame to another device on the same local network, the device sending the frame will use the MAC address of the destination device
What destination MAC address would be included in a frame sent from a source device to a destination device on a remote local network? A broadcast MAC address of FF-FF-FF-FF-FF-FF. The MAC address of the destination device. The MAC address of the local router interface.
The MAC address of the local router interface. When sending a frame to another device on a remote network, the device sending the frame will use the MAC address of the local router interface, which is the default gateway
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 arp -a ipconfig /all route print
arp -a ARP is a protocol used with IPv4 to map a MAC address to an associated specific IP address. The command arp-a will display the MAC address table on a Windows PC
What is the purpose of ARP in an IPv4 network? to obtain a specific MAC address when an IP address is known to forward data onward based on the destination MAC address. to build the MAC address table in a switch from the information that is gathered to forward data onward based on the destination IP address
to obtain a specific MAC address when an IP address is known ARP performs two functions: *To obtain a specific MAC address when an IP address is known, by broadcasting and ARP request message to all devices on a particular Ethernet network *To use the gathered information to create a viewable table of IP address to MAC address mappings