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NEW QUESTION: 1
Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?
A. One copy of the block is written to a node in each of three racks
B. Because there are seven racks the block is written to a node on each rack
C. One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
D. All three of the block are written to nodes on the same rack
Answer: C
Explanation:
HDFS uses rack-aware replica placement policy. In default configuration there are total 3 copies of a datablock on HDFS, 2 copies are stored on datanodes on same rack and 3rd copy on a different rack.
Note:HDFS is designed to reliably store very large files across machines in a large cluster. It stores each file as a sequence of blocks; all blocks in a file except the last block are the same size. The blocks of a file are replicated for fault tolerance. The block size and replication factor are configurable per file. An application can specify the number of replicas of a file. The replication factor can be specified at file creation time and can be changed later. Files in HDFS are write-once and have strictly one writer at any time.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,How the HDFS Blocks are replicated?
NEW QUESTION: 2
A. Option D
B. Option A
C. Option C
D. Option B
Answer: C
NEW QUESTION: 3
Which of the following is a tool that runs on the Windows OS and analyzes iptables log messages to detect port scans and other suspicious traffic?
A. PSAD
B. NetRanger
C. Hping
D. Nmap
Answer: A
Explanation:
PSAD is a tool that runs on the Windows OS and analyzes iptables log messages to detect port scans and other suspicious traffic. It includes many signatures from the IDS to detect probes for various backdoor programs such as EvilFTP, GirlFriend, SubSeven, DDoS tools (mstream, shaft), and advanced port scans (FIN, NULL, XMAS). If it is combined with fwsnort and the Netfilter string match extension, it detects most of the attacks described in the Snort rule set that involve application layer data. Answer option C is incorrect. NetRanger is the complete network configuration and information toolkit that includes the following tools: a Ping tool, Trace Route tool, Host Lookup tool, Internet time synchronizer, Whois tool, Finger Unix hosts tool, Host and port scanning tool, check multiple POP3 mail accounts tool, manage dialup connections tool, Quote of the day tool, and monitor Network Settings tool. These tools are integrated in order to use an application interface with full online help. NetRanger is designed for both new and experienced users. This tool is used to help diagnose network problems and to get information about users, hosts, and networks on the Internet or on a user computer network. NetRanger uses multi-threaded and multi-connection technologies in order to be very fast and efficient. Answer option D is incorrect. Nmap is a free open-source utility for network exploration and security auditing. It is used to discover computers and services on a computer network, thus creating a "map" of the network. Just like many simple port scanners, Nmap is capable of discovering passive services. In addition, Nmap may be able to determine various details about the remote computers. These include operating system, device type, uptime, software product used to run a service, exact version number of that product, presence of some firewall techniques and, on a local area network, even vendor of the remote network card. Nmap runs on Linux, Microsoft Windows, etc.
NEW QUESTION: 4
What is the correct command to set the router ID for an OSPFv3 process?
A. router-id 2011::1
B. router-id Loopback00
C. router-id FF02::5
D. router-id 1.2.3.4
Answer: D
Explanation:
Explanation Stub Router ipv6 unicast-routing ipv6 cef ! interface serial 0/0 no ip address ipv6 enable ipv6 address 2001:ABAB::/64 eui-64 ipv6 ospf 1 area 2 ! ipv6 router ospf 1 router-id 3.3.3.3 area 2 stub !
Reference http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b40d8a.s html