Answers to Analysis Questions
Written on 15:10 by Ahmet Emir
1. B, D. To about-face a bifold cardinal into decimal, you aloof accept to add the ethics of anniversary bit that
is a 1. The ethics of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157. Hexadecimal
is a base-16 cardinal system. The ethics 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 actualize all the numbers you’ll anytime need. So,
if 1001 in bifold is 9, again the hexadecimal agnate is 9. Back we again accept 1101, which
is 13 in binary, the hexadecimal acceptance is D and the complete hexadecimal acceptance is 0x9D.
Even admitting binary/hex numbers were discussed in Chapter 1, a acceptable analysis is all-important here.
2. C. Proxy ARP can advice machines on a subnet ability alien subnets after configuring routing
or a absence gateway.
3. C. Dynamic Host Configuration Agreement (DHCP) is acclimated to accommodate IP advice to hosts
on your network. DHCP can accommodate a lot of information, but the best accepted is IP address,
subnet mask, absence gateway, and DNS information.
4. B. Abode Resolution Agreement (ARP) is acclimated to acquisition the accouterments abode from a known
IP address.
5. A, C, D. This seems like a adamantine catechism at aboriginal because it doesn’t accomplish sense. The listed
answers are from the OSI archetypal and the catechism asked about the TCP/IP agreement assemblage (DoD
model). However, let’s aloof attending for what is wrong. First, the Session band is not in the TCP/
IP model; neither are the Data Link and Physical layers. This leaves us with the Transport layer
(Host-to-Host in the DoD model), Internet band (Network band in the OSI), and Application
layer (Application/Process in the DoD).
6. C. A Class C arrangement abode has abandoned 8 $.25 for defining hosts: 28 – 2 = 254.
7. A, B. A applicant that sends out a DHCP Discover bulletin in adjustment to accept an IP address
sends out a advertisement at both band 2 and band 3. The band 2 advertisement is all Fs in hex, or
FF:FF:FF:FF:FF:FF. The band 3 advertisement is 255.255.255.255, which agency all networks and
all hosts. DHCP is connectionless, which agency it uses User Datagram Agreement (UDP) at the
Transport layer, additionally alleged the Host-to-Host layer.
8. B. Although Telnet does use TCP and IP (TCP/IP), the catechism accurately asks about band 4,
and IP works at band 3. Telnet uses TCP at band 4.
9. C, D. Internet Control Bulletin Agreement (ICMP) is acclimated to accelerate absurdity letters through the
network, but they do not assignment alone. Every articulation or ICMP burden charge be encapsulated
within an IP datagram (or packet).
10. B, D, E. SMTP, FTP, and HTTP use TCP.
11. A, C, F. Explanation:DHCP, SNMP, and TFTP use UDP. SMTP, FTP, and HTTP use TCP.
12. C, D, E. Telnet, File Transfer Agreement (FTP), and Trivial FTP (TFTP) are all Application layer
protocols. IP is a Arrangement band protocol. Transmission Control Agreement (TCP) is a Transport
layer protocol.
Answers to Analysis Questions 109
13. C. First, you should apperceive calmly that abandoned TCP and UDP assignment at the Transport layer, so now
you accept a 50/50 shot. However, back the attack has sequencing, acknowledgment, and window
numbers, the acceptance can abandoned be TCP.
14. A. Both FTP and Telnet use TCP at the Transport layer; however, they both are Application
layer protocols, so the Application band is the best acceptance for this question.
15. C. The four layers of the DoD archetypal are Application/Process, Host-to-Host, Internet, and Network
Access. The Internet band is agnate to the Arrangement band of the OSI model.
16. C, E. Class A clandestine abode ambit is 10.0.0.0 through 10.255.255.255. Class B private
address ambit is 172.16.0.0 through 172.31.255.255, and Class C clandestine abode ambit is
192.168.0.0 through 192.168.255.255.
17. B. The four layers of the TCP/IP assemblage (also alleged the DoD model) are Application/Process,
Host-to-Host, Internet, and Arrangement Access. The Host-to-Host band is agnate to the
Transport band of the OSI model.
18. B, C. ICMP is acclimated for affection and destination aloof messages. ICMP is encapsulated
within IP datagrams, and because it is acclimated for diagnostics, it will accommodate hosts with
information about arrangement problems.
19. C. The ambit of a Class B arrangement abode is 128–191. This makes our bifold range
10xxxxxx.
20. D. DNS uses TCP for area exchanges amid servers and UDP back a applicant is aggravating to
resolve a hostname to an IP address.
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