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- CCNA Routing and Switching 200-105
136.
Examine the output taken from a router using IP SLA. Which of the following
answers list a fact that can be confirmed based on this output? (Choose two answers.)
R3# show ip sla summary
IPSLAs Latest Operation Summary
Codes: * active, ^ inactive, ~ pending
ID Type Destination Stats Return Last
(ms) Code Run
-----------------------------------------------------------------------
*1 icmp-echo 10.1.1.1 RTT=384 OK 54 seconds ago
- A.The probe sends ICMP Echos to address 10.1.1.1.
- B.The output confirms that an Echo Reply was received back as well.
- C.The one-way delay through the network for the latest test was 384 ms.
- D.The "1" means that this output is the first historical record for this probe.
- Answer & Explanation
- Report
Answer : [A and B]
Explanation :
Explanation :
| The show ip sla summary command lists one line of information about the most recent attempt to perform the actions of an IP SLA probe. The Type implies an ICMP Echo probe, and the destination defines the IP address to which the Echo is sent, accounting for one correct answer. The “OK” return code means not only was the probe message sent, but in this case, that an ICMP Echo Reply packet was received back. For the two incorrect answers, the Stats column lists the round-trip time (RTT), not the one-way delay as mentioned in one answer. Also, the “1” on the far left of the output refers to the IP SLA operation number. |
137.
Host1 and Host2 connect to ports F0/1 and F0/2 on a LAN switch, respectively, so
that frames sent by Host1 to Host2 will enter switch port F0/1 and exit switch port
F0/2. All FastEthernet ports on the switch are access ports in VL AN 5. A network
analyzer connects to port F0/9. A network engineer wants to use SPAN to direct
traffic to the network analyzer. Which one answer is the best answer for what traffic
to direct to the analyzer with SPAN, if the goal is to gather all traffic sent between
Host1 and Host2, but to avoid gathering multiple copies of the same frames?
- A.Use a SPAN source VLAN of VLAN 5 for both directions of traffic.
- B.Use a SPAN source port of F0/1 for the transmit direction of traffic.
- C.Use a SPAN source port of F0/2 for both directions of traffic.
- D.Use a SPAN source port of both F0/1 and F0/2 for both directions of traffic.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
|
The requirements in the question ask that you gather all traffic sent between Host1
and Host2, to avoid gathering extra copies of the same frame. That requirement
means you need to capture frames sent from Host1 to Host2, and frames sent from
Host2 back to Host1. It also means that the solution should not capture the same
frame multiple times. Each incorrect answer either gathers too little traffic, or gathers
the required traffic but also more traffic than the correct answer would gather. First, the answer of collecting from F0/1 for a single (transmit) direction is incorrect because it gathers too little traffic. Frames sent by Host2 to Host1 would arrive in switch port F0/2 and then be sent out port F0/1 to Host1, and would be copied by the SPAN session. However, frames sent by Host1 would be received on switch port F0/1, and would not be copied by that SPAN session. The answer about using VLAN 5 as a source would work, but because all FastEthernet ports on the switch are in VLAN 5, this option gathers more traffic than is necessary. The answer about using F0/2 as the source, for both directions of traffic, is correct. It will copy all frames sent by Host1 to Host2 (frames that the switch transmits out port F0/2), as well as frames sent by Host2 to Host1 (which will be frames received on switch port F0/2). This option does gather frames sent between Host2 and other hosts as well. The final incorrect answer refers to collecting traffic from both F0/1 and F0/2, but in both directions. That option would gather all frames sent between Host1 and Host2 twice, which would work, but the question asked that you gather no more traffic than is required. |
138.
Which of the following are allowed when configuring Local SPAN sessions? (Choose
two answers.)
- A.Using more than one SPAN source port in one SPAN session
- B.Using a SPAN source port and SPAN source VLAN in one SPAN session
- C.Using an EtherChannel port as a SPAN source port
- D.Using one SPAN destination port in two different SPAN sessions
- Answer & Explanation
- Report
Answer : [A and C]
Explanation :
Explanation :
| Local SPAN has a variety of configuration dependencies. Each Local SPAN session can have multiple sources, but they must be either interfaces or VLANs, and not a mix. Source ports can include both access and trunk ports as well as EtherChannel interfaces. Finally, each SPAN destination port can be used in only one SPAN session at the same time. To reuse that destination port, you must first unconfigure the destination port from the original SPAN session (no monitor session destination) and then configure it to be part of another SPAN session. |
139.
Which of the following cloud services is most likely to be used for software development?
- A.IaaS
- B.PaaS
- C.SaaS
- D.SLBaaS
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
|
PaaS (Platform as a Service) supplies one or more virtual machines (VM) that have
a working operating system (OS) as well as a predefined set of software development
tools. As for the wrong answers, Software as a Service (SaaS) supplies a predefined software application, but typically with no ability to then later install your own applications. IaaS (Infrastructure as a Service) supplies one or more working VMs, optionally with an OS installed, so it could be used for software development, but the developer would have to install a variety of development tools, making IaaS less useful than a PaaS service. Finally, SLBaaS (Server Load Balancing as a Service) can be offered as a cloud service, but it is not a general service in which customers get access to VMs on which they can then install their own applications. |
140.
Which of the following cloud services is most likely to be purchased and then used
to later install your own software applications?
- A.IaaS
- B.PaaS
- C.SaaS
- D.SLBaaS
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
|
IaaS (Infrastructure as a Service) supplies one or more working virtual machines
(VM), optionally with an OS installed, as a place where you can then customize the
systems by installing your own applications. Software as a Service (SaaS) supplies a predefined software application, but typically with no ability to then later install your own applications. Platform as a Service (PaaS) could be used to install your own application, because PaaS does supply one or more VMs, but it is most likely used as a software development environment, a service designed specifically to be used for development, with VMs that include various tools that are useful for software development. Finally, SLBaaS (Server Load Balancing as a Service) can be offered as a cloud service, but it is not a general service in which customers get access to VMs on which they can then install their own applications. |
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