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NEW QUESTION: 1
Which of the following devices implements CSMA/CA virtually through the RTS/CTS protocols?
A. Switch
B. 802.11 AP
C. Firewall
D. Router
Answer: B
Explanation:
Explanation/Reference:
Explanation:
802.11 AP is a Wireless Access Point used in a wireless network.
If two computers on a network send data frames at the same time, a collision between the frames can occur. The frames are then discarded and the sending computers will attempt to send the data again.
Carrier sense multiple access with collision avoidance (CSMA/CA) is a protocol used in wireless networks where computers connected to the wireless network attempt to avoid collisions by transmitting data only when the channel is sensed to be "idle". Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is unreliable in wireless networks because computers connected to the wireless network often cannot see each other so CSMA/CA is a better option for avoiding collisions.
Request to Send/Clear to Send (RTS/CTS) can also be used to mediate access to the wireless network.
This goes some way to alleviating the problem of computers not being able to see each other because in a wireless network, the Wireless Access Point only issues a "Clear to Send" to one node at a time.
With RTS/CTS, a Request to Send (RTS) packet is sent by the sending computer, and a Clear to Send (CTS) packet is sent by the intended receiver. This will alert all computers within range of the sender, receiver or both, to not transmit for the duration of the transmission. This is known as the IEEE 802.11 RTS/CTS exchange.
NEW QUESTION: 2
A. Option D
B. Option E
C. Option C
D. Option B
E. Option A
Answer: A,B,D
Explanation:
Reference:http://docs.oracle.com/cd/B28359_01/backup.111/b28270/rcmrepai.htm#BRAD V89728
NEW QUESTION: 3
Which three statements about RSTP are true? (Choose three.)
A. RSTP port states are blocking, discarding, learning, or forwarding.
B. RSTP uses the same timer-based process as STP on point-to-point links.
C. RSTP also uses the STP proposal-agreement sequence.
D. RSTP significantly reduces topology reconverging time after a link failure.
E. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
F. RSTP expands the STP port roles by adding the alternate and backup roles.
Answer: D,E,F
Explanation:
One big disadvantage of STP is the low convergence which is very important in switched
network. To overcome this problem, in 2001, the IEEE with document 802.1w introduced
an evolution of the Spanning Tree Protocol: Rapid Spanning Tree Protocol (RSTP), which
significantly reduces the convergence time after a topology change occurs in the network.
While STP can take 30 to 50 seconds to transit from a blocking state to a forwarding state,
RSTP is typically able to respond less than 10 seconds of a physical link failure.
RSTP works by adding an alternative port and a backup port compared to STP. These
ports are allowed to immediately enter the forwarding state rather than passively wait for
the network to converge.
RSTP bridge port roles:
*Root port - A forwarding port that is the closest to the root bridge in terms of path cost
*Designated port - A forwarding port for every LAN segment
*Alternate port - A best alternate path to the root bridge. This path is different than using the root port. The alternative port moves to the forwarding state if there is a failure on the designated port for the segment.
*Backup port - A backup/redundant path to a segment where another bridge port already connects. The backup port applies only when a single switch has two links to the same segment (collision domain). To have two links to the same collision domain, the switch must be attached to a hub.
*Disabled port - Not strictly part of STP, a network administrator can manually disable a port.