A.A
B.B
C.C
D.D
A.A
B.B
C.C
D.D
Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an(1)from afriend who asks you to open. This is what happens with Melissa and several other similar Email(2). Upon running, such worms usually proceed to send themselves out to Email addresses from the victim's address book, previous Emails, web pages(3).
As administrators seek to block dangerous Email attachments through the recognition of well-known(4), virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the(5)access to your network.
【填空题】再听录音或仔细阅读文本,并完成测验。 Programming Languages Student: Professor Martin, I just finished my Java assignment, but I still have some questions. Instructor: Sure, Andrew. Student: I’m having a hard time keeping all the languages straight. There are so many. Instructor: There are quite a few. Which ones are you having trouble with? Student: All of them. I think it’s confusing to have all these (1). Instructor: I see where you’re coming from. It’s a lot to learn. Student: But why are there so many different languages? Instructor: The first reason is that it makes developing (2) easier. Student: How is that? Instructor: The computer only understands commands in (3) language, or (4) digits. It would take programmers a long time to write programs in binary format. Student: I see. Instructor: Instead, programmers use human readable (5) languages, like Java. That allows us to write programs faster than ever before. Student: I understand that. But why are there so many human-readable programming languages? Instructor: Some human-readable programming languages are more appropriate for certain kinds of software. Does that answer your question? Student: Yes. I guess that makes sense. Thanks.
A. [edit protocols bgp group external] user@router# set interfaces ge-0/0/0.42 ?
B. [edit protocols bgp group external] user@router# edit show interfaces ge-0/0/0.42
C. [edit protocols bgp group external] user@router# top show interfaces ge-0/0/0.42
D. [edit protocols bgp group external] user@router# show interfaces ge0/0/0.42
A. PPP
B. UDP
C. TCP
D. ICMP
A.OSPF has a single preference value for both internal and external routes.
B.RIP is preferred over OSPF external routes.
C.Direct, local, and static routes have the same preference value.
D.OSPF‘s preference value is lower than BGP (both IBGP and EBGP).
A.A
B.B
C.C
D.D
E.E
A. You can see the contents of the log file by entering the show log <filename> command
B. Trace options will send information to your screen automatically
C. Trace options are limited to one protocol at a time
D. The file name and set of flags may be specified when enabling trace options
A. TTL
B. flags
C. checksum
D. type
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