Cisco 351-001 Online Practice Questions and Exam Preparation

Cisco 351-001 Online Questions & Answers

• Question 901:

  Which object tracking function tracks the combined states of multiple objects?

  A. application
  B. interface
  C. stub-object
  D. list
  D. list

• Question 902:

  Which option describes how a VTPv3 device responds when it detects a VTPv2 device on a trunk port?

  A. It sends VTPv3 packets only.
  B. It sends VTPv2 packets only.
  C. It sends VTPv3 and VTPv2 packets.
  D. It sends a special packet that contains VTPv3 and VTPv2 packet information.
  C. It sends VTPv3 and VTPv2 packets.

  ---

  When a VTP version 3 device on a trunk port receives messages from a VTP version 2 device, the VTP version 3 device sends a scaled-down version of the VLAN database on that particular trunk in a VTP version 2 format. A VTP version 3 device does not send out VTP version 2-formatted packets on a trunk port unless it first receives VTP version 2 packets on that trunk. If the VTP version 3 device does not receive VTP version 2 packets for an interval of time on the trunk port, the VTP version 3 device stops transmitting VTP version 2 packets on that trunk port. Even when a VTP version 3 device detects a VTP version 2 device on a trunk port, the VTP version 3 device continues to send VTP version 3 packets in addition to VTP version 3 device 2 packets, to allow two kinds of neighbors to coexist on the trunk. VTP version 3 sends VTP version 3 and VTP version 2 updates on VTP version 2-detected trunks.

  Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/vtp.html

• Question 903:

  Which two statements about logging are true? (Choose two.)

  A. Log messages are sent to the console port by default.
  B. Log messages are displayed in a Telnet session by default.
  C. Interface status changes are logged at the Notification level.
  D. Interface status changes are logged at the Informational level.
  E. System restart messages are logged at the Critical level.
  F. Reload requests are logged at the Notification level.
  A. Log messages are sent to the console port by default.
  C. Interface status changes are logged at the Notification level.

  ---

  By default, switches send the output from system messages and debug privileged EXEC commands to a logging process. The logging process controls the distribution of logging messages to various destinations, such as the logging buffer, terminal lines, or a UNIX syslog server, depending on your configuration. The process also sends messages to the console.

  Table 29-3 Message Logging Level Keywords

  Level Keyword

  Level

  Description

  Syslog Definition

  emergencies

  System unstable

  LOG_EMERG

  alerts

  Immediate action needed

  LOG_ALERT

  critical

  Critical conditions

  LOG_CRIT

  errors

  Error conditions

  LOG_ERR

  warnings

  Warning conditions

  LOG_WARNING

  notifications

  Normal but significant condition

  LOG_NOTICE

  informational

  Informational messages only

  LOG_INFO

  debugging

  Debugging messages

  LOG_DEBUG

  The software generates four other categories of messages:

  ?

  Error messages about software or hardware malfunctions, displayed at levels warnings through emergencies. These types of messages mean that the functionality of the switch is affected. For information on how to recover from these

  malfunctions, see the system

  ?

  Output from the debug commands, displayed at the debugging level. Debug commands are typically used only by the Technical Assistance Center.

  ?

  Interface up or down transitions and system restart messages, displayed at the notifications level. This message is only for information; switch functionality is not affected.

  ?

  Reload requests and low-process stack messages, displayed at the informational level. This message is only for information; switch functionality is not affected.

  References:

  http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12- 1_9_ea1/configuration/guide/scg/swlog.html http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12- 2_55_se/configuration/

  guide/scg_2960/swlog.html

• Question 904:

  Which three actions can you take to mitigate excessive unicast packet flooding? (Choose three)

  A. Configure a switchport for trunking mode.
  B. Enable spanning tree portfast.
  C. Configure storm control.
  D. Configure switchport blocking.
  E. Create a native VLAN.
  F. Configure a switchport for protected mode.
  B. Enable spanning tree portfast.
  C. Configure storm control.
  D. Configure switchport blocking.

• Question 905:

  Which trunking configuration between two Cisco switches can cause a security risk?

  A. configuring different native VLANs on the switches
  B. configuring different trunk modes on the switches
  C. configuring mismatched VLANs on the trunk
  D. disabling DTP on the trunk ports
  E. configuring incorrect channel-groups on the switches
  A. configuring different native VLANs on the switches

• Question 906:

  DRAG DROP

  Drag and drop the TACACS+ configuration command on the left to the correct function it performs on the right.

  Select and Place:

  

  

• Question 907:

  Refer to the exhibit.

  

  Which VLANs are permitted to send frames out port FastEthernet0/1?

  A. 100 - 200
  B. 4 - 100
  C. 1 and 4 - 100
  D. 3 and 4 - 100
  D. 3 and 4 - 100

  ---

  Traffic on the native vlan does not get tagged as it crosses a trunk, so there is no dot1q tag in the first place to be filtered. And you don't need to allow the native vlan. But if we force to tag the native vlan (with the "switchport trunk native vlan tag" command) then if the native vlan is not in the "allowed vlan" list it will be dropped.

• Question 908:

  Refer to the exhibit.

  

  Which statement about the device routing table is true?

  A. Only networks 10.10.10.0/24 and smaller from host 192.168.168.1 are in the routing table.
  B. Only networks 10.10.10.0/24 and larger from host 192.168.168.1 are in the routing table.
  C. Only network 10.10.10.0/24 from host 192.168.168.1 is in the routing table.
  D. Networks 10.10.10.0/24 and smaller from any host are in the routing table.
  A. Only networks 10.10.10.0/24 and smaller from host 192.168.168.1 are in the routing table.

  ---

  When you add the keywords "GE" and "LE" to the prefix-list, the "len" value changes its meaning. When using GE and LE, the len value specifies how many bits of the prefix you are checking, starting with the most significant bit. ip prefix-list LIST permit 1.2.3.0/24 le 32 This means: Check the first 24 bits of the prefix 1.2.3.0 The subnet mask must be less than or equal to 32

  Reference: http://blog.ine.com/2007/12/26/how-do-prefix-lists-work/

• Question 909:

  Which regular expression will only allow prefixes that originated from AS 65000 and that are learned through AS 65001?

  A. ^65000_65001$
  B. 65000_65001$
  C. ^65000_65001
  D. ^65001_65000$
  D. ^65001_65000$

  ---

  The following table lists the regular expressions and their meanings:

  +------------------------------------------------------+ | CHAR | USAGE |

  +------------------------------------------------------| | ^ | Start of string |

  |------|-----------------------------------------------| | $ | End of string |

  |------|-----------------------------------------------| | [] | Range of characters |

  |------|-----------------------------------------------| | - | Used to specify range ( i.e. [0-9] ) | |------|-----------------------------------------------| | ( ) | Logical grouping |

  |------|-----------------------------------------------| | . | Any single character |

  |------|-----------------------------------------------| | * | Zero or more instances | |------|-----------------------------------------------| | + | One or more instance |

  |------|-----------------------------------------------| | ? | Zero or one instance |

  |------|-----------------------------------------------| | _ | Comma, open or close brace, open or close | | | parentheses, start or end of string, or space | +------------------------------------------------------+

  Some commonly used regular expressions include:

  +-------------+---------------------------+

  | Expression | Meaning |

  |-------------+---------------------------|

  | .* | Anything |

  |-------------+---------------------------|

  | ^$ | Locally originated routes |

  |-------------+---------------------------|

  | ^100_ | Learned from AS 100 |

  |-------------+---------------------------|

  | _100$ | Originated in AS 100 |

  |-------------+---------------------------|

  | _100_ | Any instance of AS 100 |

  |-------------+---------------------------|

  | ^[0-9]+$ | Directly connected ASes |

  +-------------+---------------------------+

  Reference: http://blog.ine.com/2008/01/06/understanding-bgp-regular-expressions/

• Question 910:

  Refer to the exhibit.

  

  Which statement about the R1 configuration is true?

  A. It supports the service timestamps log uptime command to display time stamps.
  B. The logging buffer command was used to increase the default of the buffer.
  C. The logging of warning messages is disabled.
  D. Log message sequence numbering is disabled.
  D. Log message sequence numbering is disabled.

  ---

  To disable sequence numbers, use the no service sequence-numbers global configuration command. This example shows part of a logging display with sequence numbers enableD. 000019: %SYS-5-CONFIG_I: Configured from console by

  vty2 (10.34.195.36) In this example we see the absence of sequence numbers on the log messages. Not A. In this example there are no time stamps or uptimes shown in the logs.

  Not B. The default buffer size is 4096 bytes.

  Not C. The logging level in this example is informational (level 6), which will display levels 0-6 in the logs. Warnings are level 4.