多选题 Which three of the following options are NOT fields found in an Ethernet frame?()
Version
Type
Source Port
Flags
Data
单选题 When a local loopback is activated on a PPP serial link, what indicates that the local interface is good?()
A ping to the local address succeeds.
A ping to the remote address succeeds.
A ping to the remote address received a 'TTL expired' message.
The interface shows a flag indicating that a loop is detected.
多选题 Which three statements describe the Transmission Control Protocol (TCP)?()
TCP is a transport layer protocol.
TCP is faster than the User Datagram Protocol (UDP).
TCP provides delivery notification and error checking mechanisms.
TCP uses a best effort delivery approach.
TCP application examples include HTTP and SMTP.
单选题 After issuing the show interfaces terse command, you notice that the status of one interface is "up down". What does this indicate?"()
Layer 1 on the interface is up but Layer 2 is down.
Layer 2 on the interface is up but Layer 3 has not been configured.
The interface is administratively up but the link status is down.
The interface is up but has been administratively turned off.
单选题 You are the top of the hierarchy in configuration mode. How would you save your configuration to a file on the router?()
save configuration <filename>
save config <filename>
save <filename>
save run <filename>
单选题 How many IP addresses can be configured in a given interface?()
one primary and one secondary IP address
one IP address
as many IP addresses as you want
one primary and multiple secondary IP addresses
单选题 Which statement is correct about the validate option when upgrading JUNOS software?()
It will check the MD5 checksum of the install package.
It will check if the device meets the memory requirements for the install package.
It will check the compatibility of the configuration with the install package.
It will check if the device meets the storage requirement for the install package.
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.
单选题 In which mode are users allowed to configure the device, including interfaces, protocols, user access, and system hardware properties?()
priviledged mode
configuration mode
monitoring mode
operational mode
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牵引装置的分类,可分为()。
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引起肾盂肾炎最常见的致病菌是( )。
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