1
Q
Explain the three-way-handshake in a TCP communication very briefly
A
three-way-hanshake är en proccess i TCP
1. SYN: Klienten skickar ett syn-segment (meddelande) till servern som innehåller ett specifikt sekvensnummer och flagga (spåra dataöverföringen)
2.SYN-ACK: Därefter svarar servern med ett SYN-ACK meddelande som bekräftar klienten att SYN-segmentet är mottaget på korrekt sätt och är redo för anslu*tningen, även SYN-ACK innehåller ett sekvensnummer samt bekräftelse på det mottagna SYN-segment.
- ACK: slu*tligen skickar klienten ett ACK-segment tillbaks till servern som bekräftar att den mottagit serverns SYN-ACK-segment korrekt.
Därefter är är anslu*tningen upprättad och data kan överföras säkert mellan de två enheter.
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2
Q
Write this IPV4 address in binary: 203.65.191.88
A
11001011.01000001.10111111.01011000
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3
Q
0XCA converted to binary:
A
11001010
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4
Q
What type of address is automatically assigned to an interface when IPV6 is enabled on that interface
A
Link-local
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5
Q
Match the protocol with correct port number
A
-SSH: 22
-Telnet: 23
-DNS: 53
-DHCP: 67
-HTTP: 80
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6
Q
Explain unicast, multicast and broadcast traffic.
A
-Unicast one-to-one: Innebär att meddelandet skickas från en källa till mottagare
-Multicast one-to-many: Innebär att ett meddelande skickas från en källa till flera mottagare.
-Broadcast one-to-all: innebär att ett meddelande skickas från en källa till alla enheter inom nätverket.
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7
Q
TCP Window size example:
PCA: MMS Maximum Segment Size PCB:
During three-way-handshake Window size 10.000 MSS 1.460 Send window 10.000<----------------------------------------------------------------- 1.460 bytes Sequence number 1--------------------------------------------------------------------->Recive 1-1.460 1.460 bytes Sequence number 1.461--------------------------------------------------------------->Recive 1.461-2.920
send window 19.920<——————————————–
1.460 bytes
Sequence number 2.921——————————————> Recive 2.921-4.380
ACK 4.381
window size 10.000
Recive aknowledgement send window 14.380<——————————-
REFEE TO THE EXHIBIT. WHAT DOES THE VALUE OF THE WINDOW SPECIFY?
A
The amount of data that can be sent at one time
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8
Q
Name the seven layers of the OSI-model and the name of the PDU for each layer.
A
- Application: PDU - Data
- Presentation: PDU - Data
- Session: PDU - Data
- Transport: PDU - Segment
- Datalink: PDU - Packet
- Network: PDU - Frame
- Physical: PDU -Bits
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9
Q
Name the full name of the two Data link sublayers
A
LLC - Logical Link Controller
MAC - Media Acces Control
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10
Q
Figure 2.
Refer to the exhibit. What are the source addresses an the destination Addresses in the header when the frame sent from PC A reaches PC E?
Match the MAC source and destination and the IP source and destination with the correct addresses.
A
Source MAC address: AA-AA-AA-AA-AA-AA
Source IP address: 1.1.1.1
Destination MAC adress: EE-EE-EE-EE-EE-EE
Destination IP address: 4.4.4.5
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11
Q
Match the type malicious code attack with the correct explanation
A
Virus: Malicious software attached…
Worms: self-contained programs that…
Trojan horse: An application written to local…
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12
Q
What does FTP mean and what is it used for?
Describe briefly in english or swedish
A
FTP står för (File Transfer Protocol) är ett nätverksprotokoll som överför filer mellan server och klinet. TCP inkluderas i applikationslager protokollen
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13
Q
what does the command “copy runnning-config tftp” accomplish?
A
You save the running-config to a TFTP-server (Trivial File Transfer Protocol)
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14
Q
What is a primary purpose of subnetting IPV6 address space?
A
Support hierarchical network design
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15
Q
Math the prompts with the correct configuration modes:
A
router>: User Executive Mode
Router# Privileged Executive Mode
Router(config)#: Global configuration Mode
Router(config-line)#: Line Configuration Mode
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16
Q
Figure 3.
Refer to the exhibit. How many directly connected networks does R2 have?
A
3
17
Q
figure 4.
Refer to the exhibit. What type of attack is this?
A
Disturbed Denial of Service Attack
18
Q
What is it the process of sending smaller pieces from many different conversations on the same network segment called?
A
Multiplexing
19
Q
Given 195.85.75.0/24. If you subnet borrowing 6 bits from the host portion, how many usable host addresses do you get per subnet? (Answer in digits only)
A
2
20
Q
What is the name of the protocol used to find information about directly connected to Cisco devices?
A
CDP (Cisco Discovery Protocol) är ett nätverksprotokoll av cisco för att upptäcka och samla information om direkt anslu*tna Cisco-enheter inom ett nätverk. CDP möjliggör automatiserad nätverksadminstration genom att tillåta enheter identifiera och kommunicera med varandra, och att byta enhetsnamn, IP adresser, operativsystem och hårdvarukonfiguration. Används ofta i Cisco-nätverk för att underlätta konfiguration, felsökning och övervakning av nätverksenheter.
21
Q
Which two layers from the OSI Model are merged togheter and represented by the “Network Access layer” in TCP/IP Model?
A
Physical and Datalink
22
Q
When is it neccessary to have an IP-address and a default gateway configured on a switch?
A
Det är nödvändingt att konfigurera IP och default gateway på en switch när switchen ska hantera kommunikation bortom det lokala nätverket. Ex vid fjärrhantering eller när den är den del av ett VLAN som sträcker sig över flera switchar. När en
23
Q
Match the ping indicatior with the correct explanation
A
!: Each exlamation point “indicates receipt of reply”
U: An ICMP unreachable message error of PDU was recieved
.: Each period Indicates that the network server timed out as it waits for a reply
Q: Source quench (destination too busy)
M: Could not fragment.
?: Unkown packet type
&: Packet lifetime exceeded
24
Q
You have the network 111.11.1.0 with the netmask 225.225.225.0 and needs to create a number of smaller networks with 5 usable addresses in every new network. Calculate the firs 4 networks and fil in the table below with the correct addresses:
A
1). 111.11.1.0 255.255.255.248 /29
2). 111.11.1.8 255.255.255.248 /29
3). 111.11.1.16 255.255.255.248 /29
4). 111.11.1.24 255.255.255.248 /29
25
Q
socket pair?
A
26
Q
How should traffic flow be captured in order to best understand traffic patterns in a network?
A
During peak utilization times
27
Q
Match the port numbers with the correct port number group
A
Well-known: 0-1023
Dynamic/private: 49152- 65535
Registered: 10024- 49151
28
Q
The topology of a network is the arrangement or relationship of the network devices and the interconnections between them. LAN and WAN topologies can be wieved in to ways:
A
The first one is called a: Physical topalfy digital..
The second one is called a Logical network toplagy.
