CIT 161 Intro to Networking - Module 9 Quiz - Address Resolution
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF (Topic 9.2.0 - 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 type of information is contained in an ARP table?
IPv4 address to MAC address mappings Topic 9.2.0 - 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. ARP resolves the MAC address and stores it in an ARP table.
What addresses are mapped by ARP?
IPv4 address to a destination MAC address. (Topic 9.2.0 - 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.)
What will a Layer 2 switch do when the destination MAC address of a received frame is not in the MAC table?
It forwards the frame out of all ports except for the port at which the frame was received. Topic 9.2.0 - 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 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. (Topic 9.2.0 - 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 3 Address to a Layer 2 Address (Topic 9.2.0 - The switch ARP table keeps a mapping of 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.)
Which two ICMPv6 messages are used during the Ethernet MAC address resolution process? (Choose two.)
Neighbor Solicitation Neighbor Advertisement Topic 9.3.0 - IPv6 uses neighbor solicitation (NS) and neighbor advertisement (NA) ICMPv6 messages for MAC address resolution.
Which router component holds the routing table, ARP cache, and running configuration file?
RAM Topic 9.2.0 - The routing table, ARP cache, and running configuration file are stored in volatile RAM.
What is one function of the ARP protocol?
Resolving an IPv4 address to a MAC address Topic 9.2.0 - 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 include resolving (or mapping) a domain name with its IP address and maintaining a table for the domain name/IP pairs.
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. (Topic 9.1.0 - 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 in 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.)
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 static map entry. Topic 9.2.0 - The IPv4 address of 192.168.1.255 on the 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.
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?
arp -a Topic 9.2.0 - 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.
How does the ARP process use an IPv4 address?
to determine the MAC address of a device on the same network Topic 9.1.0 - 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 the source network is discovered and added to the ARP table of the source node.
What is the purpose of ARP in an IPv4 network?
to obtain a specific MAC address when an IP address is known. (Topic 9.2.0 - ARP performs two functions: To obtain a specific MAC address when an IP address is known, by broadcasting an ARP request message to all devices on a particular Ethernet networkTo use the gathered information to create a viewable table of IP address to MAC address mappings)
