Which three statements are true about the Internet Group Management Protocol (IGMP)? ()
A. There are three IGMP modes: dense mode, sparse mode, and sparse - dense mode
B. IGMP is used to register individual hosts with a multicast group
C. IGMP version 3 enables a multicast receiving host to specify to the router which sources it should forward traffic from
D. IGMP messages a re IP datagrams with a protocol value of 2, destination address of 224.0.0.2, and a TTL value of 1
E. IGMP is a multicast routing protocol that makes packet - forwarding decisions independent of other routing protocols such as EIGRP
F. IGMP snooping ru ns on Layer 3 router
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压力容器发生爆炸时,大多数液化气体生成的蒸气的体积为液态时的()倍。
A. 三四十
B. 二三百
C. 100
D. 500
Which method implementations will write the given string to a file named "file", using UTF8 encoding?() IMPLEMENTATION a: public void write(String msg) throws IOException { FileWriter fw = new FileWriter(new File("file")); fw.write(msg); fw.close(); } IMPLEMENTATION b: public void write(String msg) throws IOException { OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("file"), "UTF8"); osw.write(msg); osw.close(); } IMPLEMENTATION c: public void write(String msg) throws IOException { FileWriter fw = new FileWriter(new File("file")); fw.setEncoding("UTF8"); fw.write(msg); fw.close(); } IMPLEMENTATION d: public void write(String msg) throws IOException { FilterWriter fw = FilterWriter(new FileWriter("file"), "UTF8"); fw.write(msg); fw.close(); } IMPLEMENTATION e: public void write(String msg) throws IOException { OutputStreamWriter osw = new OutputStreamWriter( new OutputStream(new File("file")), "UTF8" ); osw.write(msg); osw.close(); }
A. Implementation a.
B. Implementation b.
C. Implementation c.
D. Implementation d.
E. Implementation e.
甲烷在空气中的爆炸范围下限为()%。
A. 5.3;
B. 14;
C. 75;
D. 95。
DNS区域类型有三种,下面哪个不是DNS区域类型?()
A. 集成的Active Directory
B. 标准搜索区域
C. 标准主要区域
D. 标准辅助区域