多选题Which three statements are true regarding the Network Time Protocol (NTP) in JUNOS platforms?（）AMD5 authentication is supported.BA client always synchronizes to a server even when the difference between the server clock and the local clock differs by a

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多选题

Which three statements are true regarding the Network Time Protocol (NTP) in JUNOS platforms?（）

MD5 authentication is supported.

A client always synchronizes to a server even when the difference between the server clock and the local clock differs by a large amount.

JUNOS software can provide a primary time reference.

The boot-server configuration allows a router to synchronize its clock when it boots up, regardless of the offset between the NTP clock source and its internal clock.

It is useful to correlate timestamps on log files and other events for troubleshooting and forensics.

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第1题：

Which of the following a true statements regarding the use of VLANs to segment a network? (Select three)

A. They increase the size of collision domains

B. They allow logical grouping of users by function.

C. They can enhance network security.

D. They increase the size of the broadcast domain while decreasing the number of collision domains.

E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.

F. They simplify switch administration.

正确答案：BCE
B,C,E 解析：Explanation:
VLANs are used to segment a LAN into multiple, smaller LANs. This can be used to enhance security as local traffic from one VLAN will not be passed to users in other VLANS.

Incorrect Answers:
A. VLANs are used to decrease the size of a collision domain, not increase it.

D. The opposite is true.

F. The default operation of a switch is to allow all traffic and to enable all ports in VLAN1. The use of VLANs will increase the complexity of the switch environment, making for more difficult administration.

第2题：

Which statemetn is true regarding the Network Time Protocol (NTP) on Junos devices?()

A. MD5 authenticaton is supported by the Junos OS

B. Server mode is not supported by the Junos OS

C. The Junos OS can provide a primarytime reference

D. The Junos OS does not support the use of a boot server

参考答案：A

第3题：

Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)

A．Ethernet hub ports are preconfigured for full-duplex mode.

B．The host network card and the switch port must be capable of operating in full-duplex mode.

C．There are no collisions in full-duplex mode.

D．In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.

E．A dedicated switch port is required for each full-duplex node.

正确答案：BCE
解析：Explanation:
Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions.

Half-duplex Ethernet-typically 10BaseT-is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps-at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex.

And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don't need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet.

第4题：

Which of the following is true regarding the effect of EIGRP queries on the network design？（）

A、 EIGRP queries will be the most significant issue with respect to stability and convergence
B、 EIGRP queries are not a consideration as long as EIGRP has a feasible successor with a nexthop AD that is greater than the FD of the current successor route
C、 EIGRP queries will only increase the convergence time when there are no EIGRP stubsdesigned in the network

正确答案:C

第5题：

Which three statements about Syslog utilization are true?()

A.Utilizing Syslog improves network performance.

B.The Syslog server automatically notifies the network administrator of network problems.

C.A Syslog server provides the storage space necessary to store log files without using router disk space.

D.There are more Syslog messages available within Cisco IOS than there are comparable SNMP trap messages.

E.Enabling Syslog on a router automatically enables NTP for accurate time stamping。

F.A Syslog server helps in aggregation of logs and alerts.

参考答案：C, D, F

第6题：

Which statement is true regarding the Network Time Protocol (NTP) on Junos devices?()

A. MD5 authentication is supported by the Junos OS

B. Server mode is not supported by the Junos OS

C. The Junos OS can provide a primary time reference

D. The Junos OS does not support the use of a boot server

参考答案：A

第7题：

Which three statements are true of dynamic routing protocols?()

A.They are scalable.

B.They are Dijkstra based.

C.They share network layer reach ability information among neighbors.

D.They automate next hopdecisions.

E.They are tolerant of configuration errors.

参考答案：A, C, D

第8题：

Which three statements are true about Automatic Workload Repository (AWR)?()

A. All AWR tables belong to the SYSTEM schema.

B. The AWR data is stored in memory and in the database.

C. The snapshots collected by AWR are used by the self-tuning components in the database

D. AWR computes time model statistics based on time usage for activities, which are displayed in the v$SYS time model and V$SESS_TIME_MODEL views.

E. AWR contains system wide tracing and logging information.

参考答案：B, C, E

第9题：

Which of the following statements regarding routed and routing protocols are true?（）

A、A routed protocol is assigned to an interface and determines the method of packet deliver.
B、A routing protocol determines the path of a packet through a network.
C、A routed protocol determines the path of a packet through a network.
D、A routing protocol operates at the transport layer of the OSI model.
E、A routed protocol updates the routing table of a router.

正确答案:A,B

第10题：

Which three statements about Syslog utilization are true?（）

A、Utilizing Syslog improves network performance.
B、The Syslog server automatically notifies the network administrator of network problems.
C、A Syslog server provides the storage space necessary to store log files without using router disk space.
D、There are more Syslog messages available within Cisco IOS than there are comparable SNMP trap messages.
E、Enabling Syslog on a router automatically enables NTP for accurate time stamping。
F、A Syslog server helps in aggregation of logs and alerts.

正确答案:C,D,F

Which three statements are true regarding the Network Time P

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