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NEW QUESTION: 1
TCPパフォーマンスの低下を防ぐQoSメカニズムはどれですか。
A. LLQ
B. Fair-Queue
C. Rate-Limit
D. Shaper
E. WRED
F. Policer
Answer: E
Explanation:
Explanation
Weighted Random Early Detection (WRED) is just a congestion avoidance mechanism. WRED drops packets selectively based on IP precedence. Edge routers assign IP precedences to packets as they enter the network. When a packet arrives, the following events occur:
The average queue size is calculated.
2. If the average is less than the minimum queue threshold, the arriving packet is queued.
3. If the average is between the minimum queue threshold for that type of traffic and the maximum threshold for the interface, the packet is either dropped or queued, depending on the packet drop probability for that type of traffic.
4. If the average queue size is greater than the maximum threshold, the packet is dropped.
WRED reduces the chances of tail drop (when the queue is full, the packet is dropped) by selectively dropping packets when the output interface begins to show signs of congestion (thus it can mitigate congestion by preventing the queue from filling up). By dropping some packets early rather than waiting until the queue is full, WRED avoids dropping large numbers of packets at once and minimizes the chances of global synchronization. Thus, WRED allows the transmission line to be used fully at all times.
WRED generally drops packets selectively based on IP precedence. Packets with a higher IP precedence are less likely to be dropped than packets with a lower precedence. Thus, the higher the priority of a packet, the higher the probability that the packet will be delivered.
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/15- mt/qos-conavd-15-mt-book/qos-conavd-cfg-wred.html WRED is only useful when the bulk of the traffic is TCP/IP traffic. With TCP, dropped packets indicate congestion, so the packet source will reduce its transmission rate. With other protocols, packet sources may not respond or may resend dropped packets at the same rate. Thus, dropping packets does not decrease congestion.
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/xe-
16/qos-conavd-xe-16-book/qos-conavd-oview.html
Note: Global synchronization occurs when multiple TCP hosts reduce their transmission rates in response to congestion. But when congestion is reduced, TCP hosts try to increase their transmission rates again simultaneously (known as slow-start algorithm), which causes another congestion. Global synchronization produces this graph:

NEW QUESTION: 2
The IP Office can have user's extension numbers that range from one to nine digits. Additional considerations should be made when planning and assigning extension numbers for hunt groups and users. Which two are best practices when creating a uniform dial plan In the IP Office? (Choose two.)
A. Users and hunt groups must have duplicate extension numbers as long as both reside in different IP Offices in a Small Community Network.
B. Users and Groups shouldhave unique extension numbers in all IP Offices in a SmallCommunityNetwork.
C. All extensions should have the same length of digits.
D. All user's extensions should match a physicalline as long as both reside in different IP Offices In a Small Community Network.
Answer: B,C

NEW QUESTION: 3
Given an EMPLOYEES table and a SALES table, a user wants to produce a list of all employees and their associated revenue, even if no revenue exists. Which SQL statement will produce the desired list?
A. SELECT employees.name, sales.revenueFROM employeesINNER JOIN sales ON sales.emp_id = employees.id
B. SELECT employees.name, sales.revenueFROM salesLEFT OUTER JOIN employees ON employees.id = sales.emp_id
C. SELECT employees.name, sales.revenueFROM employeesINNER JOIN sales ON employees.id = sales.emp_id
D. SELECT employees.name, sales.revenueFROM salesRIGHT OUTER JOIN employees ON employees.id = sales.emp_id
Answer: D
Explanation:
Explanation/Reference:
Explanation: