Academic Skills – EHCS Are you ready for the EHCS exam? Test your skills! Step 1 of 39 2% 1. At what layer does a switch normally operate?* 2 4 7 3 2. At what layer does a router operate?* 5 2 3 4 3. What is the maximum size of an Ethernet packet?* 1300 1400 1200 1500 4. What type of protocol is considered connection-oriented?* ARP UDP ICMP TCP 5. When monitoring a network, you receive an ICMP type 8 packet. What does this represent?* Echo start Echo reply Echo request Echo recall 6. Size in bytes of the sequence and acknowledgment number in the TCP header?* 2 3 6 4 7. The default window size in bits for Windows is:* 20 8 12 16 8. IP protocol type 17 represents which type of network traffic?* TCP ICMP UDP IGRP 9. What does FIN in TCP flag define?* Used to acknowledge receipt of a previous packet or transmission Used to abort a TCP connection abruptly Used to indicate the beginning of a TCP connection Used to close a TCP connection 10. Which is the correct PCAP filter to capture all TCP traffic going to or from host 192.168.0.125 on port 25?* port 25 and host 192.168.0.125 tcp.src == 25 and ip.host == 192.168.0.125 host 192.168.0.125:25 tcp.port == 25 and ip.host == 192.168.0.125 11. Valid TCP flags include which of the following?* BGP, RST, SYN, NULL, URG ACK, FIN, RST, ECHO, SYN ACK, BIN, PSH, RST, SYN FIN, PSH, RST, URG, SYN 12. According to TCP/IP standards, what should you conclude if you send a TCP packet with only the FIN flag set and you receive a RST in response?* The port is closed The status of the port cannot be determined The port is open The port is filtered 13. Observing TCP packets with the URG, FIN, and PSH flags set is an indication of what type of behavior?* A Maimon scan A FIN scan A NULL scan An Nmap Xmas scan 14. What is the response to a nmap –sU scan when the port is open?* RST ICMP type 3 SYN/ACK no response 15. What nmap command line syntax parameter must be used in order to perform a TCP half-open scan?* -sS –sO -sH -sT Refer to the image below to answer the next question. 16. What is the protocol in the packet?* UDP TCP IGRP ICMP Refer to the image below to answer the next question. 17. What is the protocol in the packet?* ICMP IGRP TCP UDP Refer to the image below to answer the next question. 18. Refer to figure 3, what is the protocol in the packet?* IGRP UDP ICMP TCP Refer to the image below to answer the next question. 19. What are the flags set in the packet?* PSH, ACK SYN, ACK FIN, PSH, URG RST, ACK Refer to the image below to answer the next question. 20. What are the flags set in the packet?* SYN, ACK RST, ACK PSH, ACK FIN, PSH, URG 21. A port that is < 1023 is also known as a _______________ port?* Ephemeral Reserved Special Privileged 22. A port that is > 1023 is also known as a _______________ port?* Ephemeral Special Reserved Privileged 23. Of the following stances on security which one is the easiest to manage risk of?* Permissive Promiscuous Prudent Paranoid 24. Which of the following protocols is considered reliable?* ICMP TCP UDP IGRP 25. Which of the following options is used to display the interfaces in tcpdump?* –A –G –D –L 26. Which of the following options is used to display passwords in tcpdump?* –A –G –L –D 27. Which of the following Wireshark filters would be used to display accepted GET request of a web server?* Both A and B None of the above Frame contains 200 + OK Frame contains “200 OK” 28. To view the source port 22 in Wireshark you would enter which of the following filters?* tcp.srcport = 22 tcp.port == 22 tcp.port = 22 tcp.srcport == 22 29. Which command in UNIX is used to change permissions of files and directories?* chflags chperm attrib chmod 30. Which option of the kill command is considered the sure kill?* 3 5 1 9 31. Which UNIX utility will allow the viewing of compressed files without decompressing them?* zcat gzip none of the above rar 32. Which of the following password files in UNIX is only readable by root?* /etc/proc /etc/passwd /etc/password /etc/shadow 33. Which of the following netstat options will display the interfaces on a UNIX machine?* –in –an –rn –at 34. Which of the following netstat options will display the routing table on a UNIX machine?* –at –in –an –rn 35. Which of the following lsof options will display the network connections?* –a –i –c –e 36. Which of the following lsof options will display the files and network connections a process if using?* –a –c –e –i 37. Within the VMware software what is the network switch that is used for the bridged network?* VMnet0 VMnet5 VMnet8 VMnet1 38. 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