Switching Concepts
Which port speed will be autonegotiated between a host with a 1 Gbps NIC connecting to a Cisco Catalyst 2960 switch with a 100 Mbps port? o 10 Mbps o 100 Mbps o 1 Gbps o 10 Gbps
100 Mbps
What is the significant difference between a hub and a Layer 2 LAN switch? o A hub divides collision domains, and a switch divides broadcast domains. done o A switch creates many smaller collision domains, and a hub increases the size of a single collision domain. o Each port of a hub is a collision domain, and each port of a switch is a broadcast domain. o A hub forwards frames, and a switch forwards only packets.
A switch creates many smaller collision domains, and a hub increases the size of a single collision domain.
Which statement is true about broadcast and collision domains? o Adding a router to a network will increase the size of the collision domain. o The size of the collision domain can be reduced by adding hubs to a network. o The more interfaces a router has the larger the resulting broadcast domain. o Adding a switch to a network will increase the size of the broadcast domain.
Adding a switch to a network will increase the size of the broadcast domain.
What is one function of a Layer 2 switch? o Forwards data based on logical addressing o Duplicates the electrical signal of each frame to every port o Learns the port assigned to a host by examining the destination MAC address o Determines which interface is used to forward a frame based on the destination MAC address
Determines which interface is used to forward a frame based on the destination MAC address
Which two special characteristics do LAN switches use to alleviate network congestion? (Choose two.) o Fast port speeds o Fast internal switching o Low port densities o Small frame buffers
Fast port speeds Fast internal switching
What will a Cisco LAN switch do if it receives an incoming frame and the destination MAC address is not listed in the MAC address table? o Drop the frame. o Send the frame to the default gateway address. o Use ARP to resolve the port that is related to the frame. o Forward the frame out all ports except the port where the frame is received.
Forward the frame out all ports except the port where the frame is received.
Which switch characteristic helps alleviate network congestion when a 10 Gbps port is forwarding data to a 1 Gbps port? o Fast internal switching o High port density o Fast port speed o Frame buffering
Frame buffering
Which device separates broadcast domains? o Access point o Hub o Router o Switch
Router
Which network device can serve as a boundary to divide a Layer 2 broadcast domain? o Router o Ethernet bridge o Ethernet hub o Access point
Router
Which type of address does a switch use to build the MAC address table? o Destination IP address o Source IP address o Destination MAC address o Source MAC address
Source MAC address
Which switching method makes use of the FCS value? o Broadcast o Cut-through o Large frame buffer o Store-and-forward
Store-and-forward
Which option correctly describes a switching method? o Cut-through: makes a forwarding decision after receiving the entire frame o Store-and-forward: forwards the frame immediately after examining its destination MAC address o Cut-through: provides the flexibility to support any mix of Ethernet speeds o Store-and-forward: ensures that the frame is free of physical and data-link errors
Store-and-forward: ensures that the frame is free of physical and data-link errors
What does the term "port density" represent for an Ethernet switch? o The memory space that is allocated to each switch port o The number of available ports o The numbers of hosts that are connected to each switch port o The speed of each port
The number of available ports
Which information does a switch use to keep the MAC address table information current? o The destination MAC address and the incoming port o The destination MAC address and the outgoing port o The source and destination MAC addresses and the incoming port o The source and destination MAC addresses and the outgoing port o The source MAC address and the incoming port o The source MAC address and the outgoing port
The source MAC address and the incoming port
What is the purpose of frame buffers on a switch? o They provide a basic security scan on received frames. o They provide temporary storage of the frame checksum. o They execute checksum values before transmission. o They hold traffic, thus alleviating network congestion.
They hold traffic, thus alleviating network congestion.
Which two statements are true about half-duplex and full-duplex communications? (Choose two.) o Full duplex offers 100 percent potential use of the bandwidth. o Half duplex has only one channel. o All modern NICs support both half-duplex and full-duplex communication. o Full duplex allows both ends to transmit and receive simultaneously. o Full duplex increases the effective bandwidth.
o Full duplex allows both ends to transmit and receive simultaneously. o Full duplex increases the effective bandwidth.
