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Q31 You are a technician at CertKing . You tell your newly appointed CertKing trainee about public networks IP Address classes. Your trainee now wants to know if all the IP Address Classes can be assigned for public use. What would your reply be?A. All except Class E addresses.B. Only Class A and Class B addresses.C. Only Class B and Class C addresses.D. All except Class D and Class E addresses.E. Only Class A, Class C and Class E addresses.Ans: D Explanation: RFC 7980 defines the IP protocol, including multiple different classes of networks. IP defines three different network classes, called A, B, and C, from which individual hosts are assigned IP addresses. TCP/IP defines Class D (multicast) addresses and Class E (experimental) addresses as well. Reference: CertKing 640-821 Study Guide, Section 2, "IP Addressing and Subnetting" Q32 You are a technician at CertKing . Your newly appointed CertKing trainee is troubleshooting a connectivity problem on the CertKing network. She asks you what command she should use to test application layer connectivity the between source and destination. What would your reply be?A. pingB. telnetC. tracerouteD. verifyE. traceAns: B Explanation: Telnet - The standard terminal emulation protocol in the TCP/IP protocol stack. Telnet is used for remote terminal connection, enabling users to log in to remote systems and use resources as if they were connected to a local system. I was going to choose Ans A (ping), but the keyword in the question is "application layer". Ping only needs to hit the NIC and that would mean layer 1 (Physical layer). Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 589 Q33 Which of the following IP addresses for the network 124.16.32.55/28 can be assigned to hosts? (Choose three)A. 124.16.32.45B. 124.16.32.48C. 124.16.32.57D. 124.16.32.60E. 124.16.32.62F. 124.16.32.63Ans: C, D, E Explanation: In this vlsm address, 124.16.32.55 is the IP address. The /28 indicates that the subnet mask is a 28 bit mask. This equates to 11111111.11111111.11111111.11110000 in binary, or 255.255.255.240. To determine the network address, we use a mathematical operation call Logical ANDing in which we compare the binary values of the IP address and the subnet mask. In binary, the IP address is 01111100.00010000.00100000.00110111. We compare corresponding bits: 11111111.11111111.11111111.11110000 01111100.00010000.00100000.00110111 Each corresponding bit that is 1 in both IP address and subnet mask remains 1. All other bits become 0. This gives us: 01111100.00010000.00100000.00110000 In decimal format, this is: 124.16.32.48 We can calculate the number of hosts on the network by using the 2n-2 formula where n = number of hosts bits (i.e. bits not used for the subnet mask). In this case n = 4. 24-2=14. Thus network 124.16.32.48 supports 14 hosts but remember that 124.16.32.48 is the network address so the 14 hosts will be 124.16.32.49-62. Incorrect Anss: A: Using logical ANDing will reveal that 124.16.32.45/28 is a host on the 124.16.32.32 network. B: 124.16.32.48/28 is the network address for 124.16.32.55/28. D: 124.16.32.63/28 is the broadcast address for 124.16.32.55/28. Reference: CertKing 640-821 Study Guide, Section 2, "IP Addressing and Subnetting" Q34 Which of the following commands makes use ICMP to test network connectivity? (Choose all that apply.)A. telnetB. pingC. SNMPD. tracerouteE. FTPAns: B, D Explanation: IP needs to have a way to test basic IP connectivity, without relying on any applications to be working. Ping (Packet Internet Groper) uses the Internet Control Message Protocol (ICMP), sending message called an ICMP echo request to another IP address. The computer with that IP address should reply with an ICMP echo reply. Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 131 Q35 Drag the items on the left to the correct OSI layer on the right. Ans: Layer 2 Frame Utilized destination and source MAC addresses Layer 3 Packet Utilizes destination and source IP addresses Best effort delivery system Layer 4 Segment Utilizes sequence numbers Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 33 |
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