What happens to runt frames received by a Cisco Ethernet switch?
answer
The frame is dropped
question
What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)
answer
64bytes-1518bytes
question
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
answer
It will send an ARP request for the MAC address of the default gateway
question
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
answer
MAC and IP addresses
question
What are two potential network problems that can result from ARP operation? (Choose two.)
answer
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.
question
Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)
answer
Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.*
Destination IP addresses in a packet header remain constant along the entire path to a target host
question
What is the purpose of the preamble in an Ethernet frame?
answer
is used for timing synchronization
question
A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?
answer
shared memory buffering
question
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
answer
Logical link control is implemented in software.
The data link layer uses LLC to communicate with the upper layers of the protocol suite.
question
What statement describes a characteristic of MAC addresses?
answer
they must be globally unique
question
Which statement is true about MAC addresses?
answer
The first three bytes are used by the vendor assigned OUI.
question
Which destination address is used in an ARP request frame?
answer
FFFF.FFFF.FFFF
question
What addressing information is recorded by a switch to build its MAC address table?
answer
the source Layer 2 address of incoming frames.
question
The exhiibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?
answer
The switch will forward the frame to all ports except port 4
question
Which switching method uses the CRC value in a frame
answer
store and forward
question
What is auto-MDIX
answer
a feature that detects Ethernet cable type
question
When a device is sending data to another device on a remote network, the Ethernet frame is sent to the MAC address of the default gateway.
answer
true
question
The ARP table in a switch maps which two types of address together?
answer
Layer 3 address to a Layer 2 address
question
PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?
answer
PC2 will send an ARP reply with its MAC address
question
A switch with a default configuration connects four hosts. The ARP table for host A is shown. What happens when host A wants to send an IP packet to host D?
answer
Host A sens out a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the boradcast and host Dresponds with its MAC address.
question
The switches are in their default cofiguration. Host A needs to communicate with host D, but host A doesn not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?
answer
only hosts B, C, and router R1
question
Which statement describes the treatment of ARP requests on the local link?
answer
They are received and rocessed by every device on the local network.
question
What are two potential network problems that can result from ARP operation?
answer
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.
question
A collision fragment, also known as a- frame, is a frame of fewer than 64 bytes in length.
answer
RUNT
question
ARP- is a technique that is used to send fake ARP messages to other hosts in the LAN. The aim is to associate IP addresses to the wrong MAC addresses.
answer
spoofing
question
On a Cisco switch,- memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.
answer
port-based
question
cut-through
answer
has low latency
may forward runt frames
begins forwarding whent he destination address is recieved
question
store-and-forward
answer
always stores the entire frame
checks the CRC before forwarding
checks the frame length before forwarding
question
What statements describes Ethernet?
answer
it defines the most common LAN type in the world
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