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NEW QUESTION: 1
Answer:
Explanation:
Explanation
Transport Control Protocol(TCP), User Datagram Protocol (UDP) ports, and Protocol Numbers are important to TCP/IP networking, intranets, and the Internet. Ports and protocol numbers provide access to a host computer. However, they also create a security hazard by allowing uninvited access. Therefore, knowing which port to allow or disable increases a network's security. If the wrong ports or protocol numbers are disabled on a firewall, router, or proxy server as a security measure, essential services might become unavailable.
TCP port 587 is an outgoing SMTP Mail port (TLS/Start TLS Port). Used by various outgoing mail servers as an alternative to port 25.
TCP port 443 is used for Audio, video and application sharing sessions as well as data sharing sessions.
RTP/UDP port 50020-50039 must be used for outbound video sessions.
RTP/UDP port 50000-50019 must be used for outbound audio sessions.
References:
https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355e
https://www.speedguide.net/port.php?port=587
NEW QUESTION: 2
Voice quality is bad due to high delay and jitter on a link. Which two actions will improve the quality of voice calls? (Choose two.)
A. Implement LLQ for the voice class.
B. Increase the tx-ring of the egress interface.
C. Guarantee bandwidth during congestion to the voice class with a bandwidth command.
D. Increase the queue size of the voice class.
E. Decrease the queue size of the voice class.
F. Decrease the rx-ring of the egress interface.
Answer: A,E
NEW QUESTION: 3
Which three statements about RSTP are true? (Choose three.)
A. RSTP significantly reduces topology reconverging time after a link failure.
B. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
C. RSTP uses the same timer-based process as STP on point-to-point links.
D. RSTP also uses the STP proposal-agreement sequence.
E. RSTP expands the STP port roles by adding the alternate and backup roles.
F. RSTP port states are blocking, discarding, learning, or forwarding.
Answer: A,B,E
Explanation:
Explanation/Reference:
Explanation:
Convergence
Cisco enhanced the original 802.1D specification with features such as Uplink Fast, Backbone Fast, and Port Fast to speed up the convergence time of a bridged network. The drawback is that these mechanisms are proprietary and need additional configuration.
Alternate and Backup Port Roles
These two port roles correspond to the blocking state of 802.1D. A blocked port is defined as not being the designated or root port. A blocked port receives a more useful BPDU than the one it sends out on its segment.
Remember that a port absolutely needs to receive BPDUs in order to stay blocked. RSTP introduces these two roles for this purpose.
Rapid Transition to Forwarding State
Rapid transition is the most important feature introduced by 802.1w. The legacy STA passively waited for the network to converge before it turned a port into the forwarding state. The achievement of faster convergence was a matter of tuning the conservative default parameters (forward delay and max_age timers) and often put the stability of the network at stake. The new rapid STP is able to actively confirm that a port can safely transition to the forwarding state without having to rely on any timer configuration. There is now a real feedback mechanism that takes place between RSTP-compliant bridges. In order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type.
Reference:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
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