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- Question
Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?
Options- A. 155, 0x9B
- B. 157, 0x9D
- C. 159, 0x9F
- D. 185, 0xB9
- Correct Answer
- 157, 0x9D
ExplanationTo turn a binary number into decimal, you just have to add the values of each bit that is a 1. The values of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157.Hexadecimal is a base-16 number system. The values of hexadecimal are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F-16 characters total, from which to create all the numbers you'll ever need. So, if 1001 in binary is 9, then the hexadecimal equivalent is 9. Since we then have 1101, which is 13 in binary, the hexadecimal answer is D and the complete hexadecimal answer is 0x9D.
More questions
- 1. What two multicast addresses does OSPFv3 use?
- FF02::A
- FF02::9
- FF02::5
- FF02::6
Options- A. 2 only
- B. 3 only
- C. 1 and 3
- D. 3 and 4 Discuss
Correct Answer: 3 and 4
Explanation:
Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowledgments with the addresses FF02::5 for OSPF routers and FF02::6 for OSPF designated routers. These are the replacements for 224.0.0.5 and 224.0.0.6, respectively.- 2. Which of the following commands will display the current IP addressing and the layer 1 and 2 status of an interface?
- show version
- show protocols
- show interfaces
- show controllers
- show ip interface
Options- A. 1, 2 and 4
- B. 2, 3 and 5
- C. 3 and 4 only
- D. None of the above Discuss
Correct Answer: 2, 3 and 5
Explanation:
The commands show protocols, show interfaces, and show ip interface will show you the layer 1 and 2 status and the IP addresses of your router's interfaces.- 3. What is the frequency range of the IEEE 802.11b standard?
Options- A. 2.4Gbps
- B. 5Gbps
- C. 2.4GHz
- D. 5GHz Discuss
Correct Answer: 2.4GHz
Explanation:
The IEEE 802.11b and IEEE 802.11g standards both run in the 2.4GHz RF range.- 4. You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?
Options- A. Router> ping
- B. Router> trace
- C. Router> show ip route
- D. Router> show interface Discuss
Correct Answer: Router> trace
Explanation:
The command traceroute (trace for short), which can be issued from user mode or privileged mode, is used to find the path a packet takes through an internetwork and will also show you where the packet stops because of an error on a router.- 5. Your switch has a port status LED that is alternating between green and amber. What could this indicate?
Options- A. The port is experiencing errors.
- B. The port is shut down.
- C. The port is in STP blocking mode.
- D. Nothing; this is normal. Discuss
Correct Answer: The port is experiencing errors.
Explanation:
When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.- 6. A network administrator needs to configure a router with a distance-vector protocol that allows classless routing. Which of the following satisfies those requirements?
Options- A. IGRP
- B. OSPF
- C. RIPv1
- D. EIGRP
- E. IS-IS Discuss
Correct Answer: EIGRP
Explanation:
In this question, we're calling EIGRP just plain old distance vector. EIGRP is an "advanced" distance-vector routing protocol, sometimes called a hybrid routing protocol because it uses the characteristics of both distance-vector and link-state routing protocols.- 7. What command is used to stop RIP routing updates from exiting out an interface but still allow the interface to receive RIP route updates?
Options- A. Router(config-if)# no routing
- B. Router(config-if)# passive-interface
- C. Router(config-router)# passive-interface s0
- D. Router(config-router)# no routing updates Discuss
Correct Answer: Router(config-router)# passive-interface s0
Explanation:
The (config-router)#passive-interface command stops updates from being sent out an interface, but route updates are still received.- 8. Which of the following services use TCP?
- DHCP
- SMTP
- HTTP
- TFTP
- FTP
Options- A. 1 and 2
- B. 2, 3 and 5
- C. 1, 2 and 4
- D. 1, 3 and 4 Discuss
Correct Answer: 2, 3 and 5
Explanation:
SMTP, HTTP and FTP use TCP.- 9. You are unsuccessful in telnetting into a remote device. What could the problem be?
- IP addresses are incorrect.
- Access control list is filtering Telnet.
- There is a defective serial cable.
- The VTY password is missing.
Options- A. 1 only
- B. 3 only
- C. 2 and 4 only
- D. All of the above Discuss
Correct Answer: 2 and 4 only
Explanation:
The best answers, the ones you need to remember, are that either an access control list is filtering the Telnet session or the VTY password is not set on the remote device.- 10. Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
Options- A. Layer 2
- B. Layer 3
- C. Layer 4
- D. Layer 7 Discuss
Correct Answer: Layer 4
Explanation:
A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the Transport layer (layer 4).
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- 1. What two multicast addresses does OSPFv3 use?
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