Cisco 400-101 Exam Q&A

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Sample Questions

• Question 1
• Which two options are causes of out-of-order
  packets? (Choose two.)
• a routing loop
• a router in the packet flow path that is
  intermittently dropping packets
• high latency
• packets in a flow traversing multiple paths
  through the network
• some packets in a flow being process-switched and
  others being interrupt- switched on a transit
  router
• Answer DE Question 2
• Which of the following commands reboots the
  system when using SysV init? (Choose TWO correct
  answers.)
• shutdown -r now
• shutdown -r "rebooting"
• telinit 6
• telinit 0
• shutdown -k now "rebooting"
• Answer AC

• Question 3
• A TCP/IP host is able to transmit small amounts
  of data (typically less than 1500 bytes), but
  attempts to transmit larger amounts of data hang
  and then time out. What is the cause of this
  problem?
• A link is flapping between two intermediate
  devices.
• The processor of an intermediate router is
  averaging 90 percent utilization.
• A port on the switch that is connected to the
  TCP/IP host is duplicating traffic and sending
  it to a port that has a sniffer attached.
• There is a PMTUD failure in the network path.
• Answer D

3
Question 4 Refer to the exhibit. ICMP Echo
requests from host A are not reaching the
intended destination on host B. What is the
problem?

• The ICMP payload is malformed.
• The ICMP Identifier (BE) is invalid.
• The negotiation of the connection failed.
• The packet is dropped at the next hop.
• The link is congested.
• Answer D

• Question 5
• Which three conditions can cause excessive
  unicast flooding? (Choose three.)
• Asymmetric routing
• Repeated TCNs
• The use of HSRP
• Frames sent to FFFF.FFFF.FFFF
• MAC forwarding table overflow
• The use of Unicast Reverse Path Forwarding
• Answer ABE

4
Question 6 Refer to the exhibit. Which statement
is true?

• It is impossible for the destination interface to
  equal the source interface.
• NAT on a stick is performed on interface Et0/0.
• There is a potential routing loop.
• This output represents a UDP flow or a TCP flow.
• Answer C

• Question 7
• Which of the following commands will write a
  message to the terminals of all logged in users?
• bcast
• mesg
• print
• wall
• yell
• Answer D

• Question 8
• Which congestion-avoidance or congestion-managemen
  t technique can cause global synchronization?
• Tail drop
• Random early detection
• Weighted random early detection
• Weighted fair queuing
• Answer A

5

• Question 9
• Which of the following options for the kernel's
  command line changes the system boot target to
  rescue.target instead of the default target?
• systemd.targetrescue.target
• systemd.runlevelrescue.target
• systemd.servicerescue.target
• systemd.defaultrescue.target
• systemd.unitrescue.target
• Answer E Question 10
• Which two options are reasons for TCP starvation?
  (Choose two.)
• The use of tail drop
• The use of WRED
• Mixing TCP and UDP traffic in the same traffic
  class
• The use of TCP congestion control
• Answer CD

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