Which congestion-avoidance or congestion-management technique can cause global
synchronization?
A.
Tail drop
B.
Random early detection
C.
Weighted random early detection
D.
Weighted fair queuing
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C – Wred — Confirm 🙂 Weighted random early detection (WRED) is a queueing discipline for a network scheduler suited for congestion avoidance.
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The Cisco 400-101 exam is a very hard exam to successfully pass. Here you will find free Cisco 400-101 practice sample exam test questions that will help you prepare in passing the 400-101 exam:
QUESTION 301
Refer to the exhibit. What conclusion can you draw from the given ping output?
A. The ping operation sent packets ranging from 505 to 1500 bytes in size
B. The Verbose option was set in the IP header
C. The packet life was exceeded in 5 percent of the oper ations
D. Fragmentation faited duting the ping operation
Answer: D
QUESTION 302
Refer to the exhibit. You notice that when interface F0/0 goes down.the device fails to install the floating static route to next hop 192.168.21.2 interface route table.
Which action can you take to correct the problem?
A. Configure the primary route with an outgoing interface only
B. Configure the primary route with a next-hop address and an outgoing interface
C. Configure a summary route to the next hop router on interface F0/1
D. Configure a summary route to the next hop router on interface F0/0
Answer: B
QUESTION 303
Which two statements about static routing are true?(Choose twe)
A. It is highly scalable as networks grow
B. It requires less bandwidth and fewer CPU cycles than dunamic routing protocols
C. It reduces configuration errors
D. It can be implemented more quickly than dumamic routing
E. It provides better security than dynamic routing
Answer: BE
QUESTION 304
Refer to the exhibit. Which router will be used tou forward traffic to destinations unknown in the area?
A. R3
B. R5
C. R2
D. R4
E. R1
F. R6
Answer: E
QUESTION 305
Which feature must be enabled so that an IS-IS single topology can support IPv6 traffic?
A. old-style TLVs only
B. bot new-and old-style TLVS
C. adjacency checking
D. new-style TLVS only
E. extended metrics
Answer: E
QUESTION 306
Which technology allows a device to filter routes into and out of an MPLS VPN?
A. route distinguishers
B. route targets
C. LDP
D. CEF
Answer: B
QUESTION 307
Which IPv6 migrationg metod allows IPv4-only devices to communicate with IPv6-only dual?
A. dual stack
B. GRE tunnel
C. ISATAP tunnel
D. NAT64
Answer: D
QUESTION 308
Refter to the exihibit. When R2 attempted to copy a file from the TFTP server, it received this error message. Which action can you take to correct the problem?
A. Change the access-list configuration on R1to access-list 1permit 17216.1.0 0.0.0.255
B. Configure the ip tftp source-interface Fa0/1 command on R1
C. Configure the ip tftp source-interface Fa0/1 command on R2
D. Configure the ip tftp source-interface Loopback0 command on R2
E. Configure the ip tftp source-interface Loopback0 command on R1
Answer: D
QUESTION 309
Which statement about Cisco Express Forwarding is true?
A. The FIB table resides on the route processor and the adjacency table resides on the line cards when Cisco Express Forwarding is enabled
B. The FIB table and the adjacency table reside on the line cards when Cisco Express Forwarding is enabled
C. Layer 2 next-hop address information is maintained in the FIB table
D. Layer 2 next-hop address information is maintained in the adjacency table
Answer: D
QUESTION 310
……
I have uploaded all the real questions of 400-101 exam to my Google Drive: https://drive.google.com/open?id=0B3Syig5i8gpDZ0lrZUFjNWtFYlk
Welcome to download them freely!
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Tail Drop, Random Early Detection, RED and Weighted Random Early Detection are all mechanisms Network Schedulers using for congestion-avoidance or congestion-management. However the one that will cause TCP global synchronization is Tail Drop, and that was why RED came on board to correct, with an improvement with WRED.
So which is the best, perhaps WRED, but Tail drop is the easiest technique to limit queue size but it causes TCP global synchronisation.
Final answer is A. Tail Drop
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