Module 9 Test Questions
What is the ether type for ARP?
0x0806 (pg. 11)
Where are the ARP entries contained?
An ARP table (or ARP cache). (pg. 9)
Which destination address is used in an ARP request frame? 0.0.0.0 255.255.255.255 FFFF.FFFF.FFFF AAAA.AAAA.AAAA The physical address of the destination host
FFFF.FFFF.FFFF (pg. 13)
What do you learn when you ARP a remote network?
Learn MAC address of default gateway. (pg. 18)
What does a switch do with a sent frame which is addressed to a specific computer? The switch will discard the frame The switch will forward the frame out all ports The switch will forward the frame out all ports other than the ingress port The switch will only forward the frame only to the port with the destination computer connected
The switch will forward the frame out all ports other than the ingress port. (pg. 27)
What is the aim of an ARP spoofing attack? To flood the network with ARP reply broadcasts To fill switch MAC address tables with bogus addresses To associate IP addresses to the wrong MAC address To overwhelm network hosts with ARP requests
To associate IP addresses to the wrong MAC address. (pg. 24)
What is the function of ARP?
To determine the destination MAC address of a local device when it knows its IPv4 address. (pg. 9)
Who do you ARP when you want to ARP off your network?
Your router/default gateway. (pg. 18)
What property of ARP allows MAC addresses of frequently used servers to be fixed in the ARP table? A static IP-to-MAC address entry can be entered manually into an ARP table Entries in an ARP table are time-stamped and are purged after the timeout expires The type field 0x806 appears in the header of the Ethernet frame The port-to-MAC address table on a switch has the same entries as the ARP table on the switch
A static IP-to-MAC address entry can be entered manually into an ARP table. (pg. 22)
What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward? Source MAC address Source IP address Destination MAC address Ethernet type Destination IP address
Destination MAC address. (pg. 6)
Which two types of IPv6 messages are used in place of ARP for address resolution? Anycast Broadcast Echo reply Echo request Neighbor solicitation Neighbor advertisement
Neighbor solicitation Neighbor advertisement. (pg. 33)
What are two potential network problems that can result from ARP operation? Manually configuring static ARP associations could facilitate ARP poisonings or MAC address spoofing On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays Network attackers could manipulate MAC address and IP address table to overflow and prevent the host from communicating on the network Multiple ARP replies result in the switch MAC address table containing entries that match the MAC addresses of hosts that are connected to the relevant switch port
On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic. (pg. 26)
A network technician issues the arp -d* command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued? The ARP cache is cleared The current content of the ARP cache is displayed The detailed information of the ARP cache is displayed The ARP cache is synchronized with the router interface
The ARP cache is cleared. (pg. 21)
What happens when the ARP cache timer expires after a specific amount of time?
The ARP table entries are removed. (pg. 19)
What property of ARP forces all Ethernet NICs to process and ARP request? The source MAC address appears in the header of the Ethernet frame The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame The type field 0x806 appears in the header of the Ethernet frame ARP replies are broadcast on the network when a host receives an ARP request
The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame. (pg. 14)
Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? The frame has the broadcast address as the destination address The destination address is unknown to the switch The source address in the frame header is the broadcast address The source address in the frame is a multicast address The destination address in the frame is a known unicast address
The frame has the broadcast address as the destination address The destination address is unknown to the switch. (pg. 25)
What property of ARP causes a reply only to the source sending an ARP request? The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame The type field 0x806 appears in the header of the Ethernet frame ARP replies are broadcast on the network when a host receives and ARP request The source MAC address appears in the header of the Ethernet frame
The source MAC address appears in the header of the Ethernet frame. (pg. 16)
Which statement describes the treatment of ARP requests on the local link? They must be forwarded by all routers on the local network They are received and processed by every device on the local network They are dropped by all switches on the local network They are received and processed only by the target device
They are received and processed by every device on the local network. (pg. 12)