IGCSE Computer Science Paper 1 Crossword: 2.1 Data Transmission Types and Methods (Modules 110–120)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
10
Across
- 2. The three parts of a packet, in order: the ______ (start) holds addresses and packet number, the ______ (middle) holds the data, the ______ (end) marks the packet's end. Word 3 of: ______, _______, _______ (7)
- 3. The ______ in a packet header of the device the packet must be delivered to. Routers read it to choose where to send the packet. It is usually an IP ______. Word 2 of: ___________ _______ (7)
- 8. Word 2 of the term in 2 Across: ______, _______, _______ (7)
- 9. The IP address of the device that sent the packet, held in the header so the receiver knows who sent it and can reply or ask for a resend. It differs from the destination address. Word 1 of: __________'s _______ (10)
- 10. Data is split into packets that are sent separately, each routed on its own from router to router, then joined back together in the right order at the destination. Word 2 of: ______ _________ (9)
Down
- 1. The first part of a ______. It holds control information: the destination address, the originator's address and the ______ number, used to deliver and reassemble the ______. Word 1 of: ______ ______ (6)
- 4. Word 1 of the term in 3 Across: ___________ _______ (11)
- 5. A ______ in the packet header showing the packet's position in the whole message (e.g. packet 3 of 10), so packets that arrive out of order can be put back in the right order. Word 2 of: ______ ______ (6)
- 6. Word 1 of the term in 2 Across: ______, _______, _______ (6)
- 7. A router reads each packet's destination address in its header and picks the next router to send it to, so every packet's route is decided one step at a time. (7)
Answer Key
IGCSE Computer Science Paper 1 · Modules 110–120
1P
2T
R
A
I
L
E
R
C
K
3A
4D
D
R
E
S
S
E
T
S
5N
T
6H
U
I
E
M
N
7R
A
B
8P
A
Y
L
O
A
D
E
T
U
E
9O
R
I
G
I
N
A
T
O
R
O
I
10S
W
I
T
C
H
I
N
G
N
G
Across
2TRAILER — The three parts of a packet, in order: the ______ (start) holds addresses and packet number, the ______ (middle) holds the data, the ______ (end) marks the packet's end. Word 3 of: ______, _______, _______
3ADDRESS — The ______ in a packet header of the device the packet must be delivered to. Routers read it to choose where to send the packet. It is usually an IP ______. Word 2 of: ___________ _______
8PAYLOAD — Word 2 of the term in 2 Across: ______, _______, _______
9ORIGINATOR — The IP address of the device that sent the packet, held in the header so the receiver knows who sent it and can reply or ask for a resend. It differs from the destination address. Word 1 of: __________'s _______
10SWITCHING — Data is split into packets that are sent separately, each routed on its own from router to router, then joined back together in the right order at the destination. Word 2 of: ______ _________
Down
1PACKET — The first part of a ______. It holds control information: the destination address, the originator's address and the ______ number, used to deliver and reassemble the ______. Word 1 of: ______ ______
4DESTINATION — Word 1 of the term in 3 Across: ___________ _______
5NUMBER — A ______ in the packet header showing the packet's position in the whole message (e.g. packet 3 of 10), so packets that arrive out of order can be put back in the right order. Word 2 of: ______ ______
6HEADER — Word 1 of the term in 2 Across: ______, _______, _______
7ROUTING — A router reads each packet's destination address in its header and picks the next router to send it to, so every packet's route is decided one step at a time.