350-401 题库答案求助

hensonhu

22号就去考了，题库已经很熟练了，但是今天突然看到其他地方的答案有些出入，望大神指引。


QUESTION 46

Which IP SLA operation requires the IP SLA responder to be configured on the remote end?

A.  UDP jitter

B.  ICMP jitter

C.  TCP connect

D.  ICMP echo


题库答案A ， https://www.ciscobraindump.com 答案D

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NEW QUESTION 9
What are two common sources of interface for WI-FI networks? (Choose two.)

A. radar
B. LED lights
C. rogue AP
D. conventional oven
E. fire alarm


题库答案BC  ,  https://www.ciscobraindump.com 答案AC ，这里我认为是AC,  LED应该不算干扰的东西吧。

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Which statement about Cisco EAP-FAST is true?
A.  It requires a client certificate.
B.  It is an IETF standard.
C.  It does not require a RADIUS server certificate.
D.  It operates in transparent mode.


题库答案 C ，https://www.ciscobraindump.com 答案A

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Which statement about VXLAN is true?

A. VXLAN uses TCP 35 the transport protocol over the physical data cento network.
B. VXLAN extends the Layer 2 Segment ID field to 24-bits. which allows up to 4094 unique Layer 2 segments over the same network.
C. VXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency across router boundaries.
D. VXLAN uses the Spanning Tree Protocol for loop prevention.

题库答案 C  ；https://www.ciscobraindump.com 答案D



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Which QoS component alters a packet to change the way that traffic is treated in the network?
A.  policing
B.  classification
C.  marking
D.  shaping

题库答案 C  ；https://www.ciscobraindump.com 答案A


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Which two pieces of information are necessary to compute SNR? (Choose two.)

A. EIRP
B. noise floor
C. antenna gain
D. RSSI
E. transmit power

题库答案 BE ；https://www.ciscobraindump.com 答案BD


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Which two operations are valid for RESTCONF? (Choose two.)

A. HEAD
B. REMOVE
C. PULL
D. PATCH
E. ADD
F. PUSH

题库答案 AD ；https://www.ciscobraindump.com 答案BD


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Which statements are used for error handling in Python?
A.  try/catch
B.  catch/release
C.  block/rescue
D.  try/except


题库答案 D ；https://www.ciscobraindump.com 答案C


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题库答案C， 我觉得是D，黄色部分是我觉得错的地方，请大神指点

david99022

QUESTION 46

Which IP SLA operation requires the IP SLA responder to be configured on the remote end?
A.  UDP jitter
B.  ICMP jitter
C.  TCP connect
D.  ICMP echo


※Before you configure a UDP jitter operation on the source device, you must enable the IP SLAs responder on the target device (the operational target).


NEW QUESTION 9
What are two common sources of interface for WI-FI networks? (Choose two.)
A. radar
B. LED lights
C. rogue AP
D. conventional oven
E. fire alarm

https://documentation.meraki.com/MR/WiFi_Basics_and_Best_Practices/Common_Sources_of_Wireless_Interference
Interference causing devices:Microwave ovens
Here are some devices that interfere with 5 GHz radios:Radar


Which statement about VXLAN is true?

A. VXLAN uses TCP 35 the transport protocol over the physical data cento network.
B. VXLAN extends the Layer 2 Segment ID field to 24-bits. which allows up to 4094 unique Layer 2 segments over the same network.
C. VXLAN encapsulates a Layer 2 frame in an IP-UDP header, which allows Layer 2 adjacency across router boundaries.
D. VXLAN uses the Spanning Tree Protocol for loop prevention.


C錯了，是MAC-UDP


Which QoS component alters a packet to change the way that traffic is treated in the network?
A.  policing
B.  classification
C.  marking
D.  shaping


https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-6/configuration_guide/qos/b_166_qos_9400_cg/b_166_qos_9400_cg_chapter_01.html#concept_ggz_zbb_p1b
這我不確定，看文件敘述比較像是classification


Which two pieces of information are necessary to compute SNR? (Choose two.)

A. EIRP
B. noise floor
C. antenna gain
D. RSSI
E. transmit power


SNR is comprised of 2 values.
a) Signal = RSSI
b) Noise



Which two operations are valid for RESTCONF? (Choose two.)

A. HEAD
B. REMOVE
C. PULL
D. PATCH
E. ADD
F. PUSH


Allow: DELETE, GET, HEAD, PATCH, POST, PUT, OPTIONS    >>>>>>>>>>>    Allowed methods


Which statements are used for error handling in Python?
A.  try/catch
B.  catch/release
C.  block/rescue
D.  try/except



python不熟，你上網找找資料

tatrick42034

python 那題可以看一下這篇，應該是 try/except沒錯
https://hub.packtpub.com/how-to- ... -catch-and-finally/

hensonhu

tatrick42034 发表于 2020-7-19 17:52
python 那題可以看一下這篇，應該是 try/except沒錯
https://hub.packtpub.com/how-to-perform-exception- ...

感谢

hensonhu

david99022 发表于 2020-7-18 13:46
QUESTION 46

Which IP SLA operation requires the IP SLA responder to be configured on the remote e ...

NEW QUESTION 9
What are two common sources of interface for WI-FI networks? (Choose two.)
A. radar
B. LED lights
C. rogue AP
D. conventional oven
E. fire alarm

https://documentation.meraki.com ... reless_Interference
Interference causing devices:Microwave ovens
Here are some devices that interfere with 5 GHz radios:Radar

这里conventional oven我查了翻译是传统烤箱，你资料里面的Microwave ovens是微波炉，两个东西工作原理不一样，烤箱就单纯发热管发热，对WIFI应该没影响，个人更偏向于rogue AP 和 radar

casio0520

感謝樓主大大的分享

AlltoWell

Why VXLAN?
VLAN Scalability - VXLAN extends the L2 Segment ID field to 24-bits, which potentially allows up to 16 million unique L2 segments over the same network.
L2 Segment Elasticity over L3 Boundary - VXLAN encapsulates an L2 frame in an IP-UDP header, which allows L2 adjacency across router boundaries.
Leverages multicast in the transport network in order to simulate flooding behavior for broadcast, unknown unicast, and multicast in the L2 segment.
Leverage Equal Cost Multi-pathing (ECMP) in order to achieve optimal path usage over the transport network.

https://www.cisco.com/c/en/us/su ... onfig-vxlan-00.html

hensonhu

AlltoWell 发表于 2020-7-20 16:41
Why VXLAN?
VLAN Scalability - VXLAN extends the L2 Segment ID field to 24-bits, which potentially a ...

感谢分享

JHEWEILI

QUESTION 15
The login method is configured on the VTY lines of a router with these parameters. . The first method for authentication is TACACS
. If TACACS is unavailable, login is allowed without any provided credentials
Which configuration accomplishes this task?

aaa authentication login telnet group tacacs+ none
是指建立名為'telnet'的authentication認證規則：tacacs+優先，若tacacs+失效則無需認證(none)
還需要再將此認證規則套用在line con或者line vty上，才會生效：
line vty 0 4
login authentication telnet
password 7 02050D480809
此時line vty的認證方式便會採用tacacs+，基本上password指令不生效

aaa authentication login default group tacacs+ none
是指建立default(預設行為)的authentication認證規則：tacacs+優先，若tacacs+失效則無需認證(none)
並且在開啟aaa new-model後，預設所有line con和line vty都視為套用一行login authentication default，即預設的authentication認證行為，所以無需特別敲進line vty：
line vty 0 4
password 7 02050D480809
此時line vty的認證方式便會採用tacacs+，password指令一樣不生效

B選項的aaa authentication login default group tacacs+
則是指tacacs+優先，若tacacs+失效則將無任何認證方式能繼續進行
並且transport input none本身將會限制無法以telnet和ssh登入設備
因此不符合題目需求

故答案C較適合
(抱歉路過純交流，離發文時間太久沒幫上忙，承蒙大家關照指教)