Module three
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.
Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?
ARP cache
Why is NAT not needed in IPv6?
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.
What is one advantage that the IPvo simplified header offers over IPv4?
Efficient package handling
What property of ARP causes cached IP-to-MAC mappings to remain in memory longer?
Entries in an ARP table are time-stamped and are purged after the timeout expires.
Which statement describes a feature of the IP protocol?
IP relies on upper layer services to handle situations of missing or out-of-order packets.
What property of ARP allows hosts on a LAN to send traffic to remote networks?
Local hosts learn the MAC address of the default gateway.
What are two potential network problems that can result from ARP operation? (Choose two.)
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.
Which term describes a field in the IPv4 packet header used to limit the lifetime of a packet?
TTL
Within a production network, what is the purpose of configuring a switch with a default gateway address?
The default gateway address is used to forward packets originating from the switch to remote networks.
What property of ARP causes the request to be flooded out all ports of a switch except for the port receiving the ARP request?
The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.
Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)
The frame has the broadcast address as the destination address. The destination address is unknown to the switch.
What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with hosts in other networks.
What property of ARP causes a reply only to the source sending an ARP request?
The source MAC address appears in the header of the Ethernet frame.
What property of ARP causes the NICS receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?
The type field 0x806 appears in the header of the Ethernet frame.
How do hosts ensure that their packets are directed to the correct network destination?
They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.
Which term describes a field in the IPv4 packet header that contains an 8-bit binary value used to determine the priority of each packet?
differentiated services
Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three.)
line con 0, login, password cisco
What routing table entry has a next hop address associated with a destination network?
remote routes
What are two services provided by the OSI network layer? (Choose two.)
routing packets toward the destination encapsulating PDUs from the transport layer
Which term describes a field in the IPv4 packet header that contains a 32-bit binary value associated with an interface on the sending device?
source IPv4 address
What is the aim of an ARP spoofing attack?
to associate IP addresses to the wrong MAC address
What are two functions of NVRAM? (Choose two.)
to retain contents when power is removed to store the startup configuration file
