Term
| Name the most common LAN protocol. |
|
Definition
|
|
Term
Name the Acronym: CSMA/CD |
|
Definition
| Carrier Sense Multiple Access / (with) Collision Detection |
|
|
Term
| What happens when a collision occurs over Ethernet? |
|
Definition
1. Jam signal sent by hosts involved in collision 2. All hosts involved briefly stop transmitting 3. Hosts each run a backoff algorithm (waits a random time before retransmission) |
|
|
Term
| What can break up a collision domain? |
|
Definition
|
|
Term
Identify the common name, speed and IEEE spec of of the following: 10-BASE 5 10-BASE T 100-BASE T 100-BASE FX 1000-BASE T 1000-BASE SX |
|
Definition
10-BASE 5/T : Ethernet, 10Mbs, 802.3 100-BASE T/FX : FastEthernet, 100Mbs, 802.3u 1000-BASE T : GigabitEthernet, 1000Mbs, 802.3ab 1000-BASE SX : GigabitEthernet, 1000 Mbs, 802.3z |
|
|
Term
Identify the duplex, media, and length of of the following: 10-BASE 5 10-BASE 2 10/100-BASE T 100-BASE T 100-BASE FX 1000-BASE T 1000-BASE ZX |
|
Definition
10-BASE 5 : Half, Thicknet, 500 m 10-BASE 2 : Half, Thinnet, 185 m 10-BASE T : Half, UTP, 100 m 100-BASE T : Half/Full, UTP, 100 m 1000-BASE T : Full, UTP, 100 m 100-BASE FX : Full, Multi-mode Optic, 400 m 1000-BASE ZX : Full, Single-mode Optic, 100 km |
|
|
Term
Name and order the layers of the Cisco hierarchical model |
|
Definition
Core --{ Distribution --{ Access |
|
|
Term
Name the acronym and order the layers of the
OSI Model |
|
Definition
Open Systems Interconnection Model:
7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Datalink
1. Physical
|
|
|
Term
Name and order the layers of the TCP/IP Model (and list the corresponding OSI layers) |
|
Definition
4. Application = Application, Presentation, Session 3. Transport = Transport 2. Internet = Network 1. Network Interface = Data Link, Physical
|
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) HTTP/HTTPS |
|
Definition
Hypertext Transfer Protocol Application layer port 80, 443 TCP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) FTP |
|
Definition
File Transfer Protocol Application Layer port 20, 21 TCP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) SMTP |
|
Definition
Simple Mail Transfer Protocol Application Layer port 25 TCP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) POP3 |
|
Definition
Post Office Protocol v. 3 Application layer port 110 TCP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) NTP |
|
Definition
Network Time Protocol Application layer port 123 UDP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) SNMP |
|
Definition
Simple Network Management Protocol Application layer port 161, 162 UDP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) TFTP |
|
Definition
Trivial File Transfer Protocol Application layer port 69 UDP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) DNS |
|
Definition
Domain Naming System Application layer port 53 TCP / UDP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) DHCP |
|
Definition
Dynamic Host Configuration Protocol Application layer port 67, 68 UDP |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) NNTP |
|
Definition
Network News Transfer Protocol Application layer port 119 TCP |
|
|
Term
| What happens when establishing a TCP connection? |
|
Definition
Three-way handshake: 1. A --> B : SYN with seq(A) 2. A <-- B : SYN with seq(B), ACK with seq(A+1) 3. A --> B : ACK with seq(B+1)
|
|
|
Term
What are the 3 main elements of Positive Acknowledgement and Retransmission (PAR) |
|
Definition
* Sender will re-transmit a segment if the timer expires before an ACK * Sender has record of all segments waiting ACK * Receiver ACKs a segment with the next sequence number expected
|
|
|
Term
What is the TCP sliding window? |
|
Definition
TCP sliding window is a method for the receiver to negotiate the transmission rate of the sender. Large window = large number of segments sent before ACK'ed. S --> R : X number packets, window size = X S <-- R : ACK of Yth packet, window size = Y S --> R : Y number packets, window size = X |
|
|
Term
| Describe the rough layout of the TCP header |
|
Definition
__________________________ [ Source port | Dest. port ] [ Sequence number ] [ Ack number ] [ misc. | win size ] [ checksum | urgent ] [ options ] |
|
|
Term
| Describe the rough layout of the UDP header |
|
Definition
_______________________ [ source port | length ] [ dest. port | checksum ] |
|
|
Term
Name the acronym and the describe the layout: MAC |
|
Definition
Media Access Control [ 6 hex chars of OUI vender code + 6 hex chars assigned by NIC manufacturer] |
|
|
Term
| List the corresponding PDUs at each layer of the OSI model |
|
Definition
Layer : Protocol Data Unit Application, Presentation, Session : Data Transport : Segment Network : Packet Data Link : Frame Physical : Bits |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) CDP |
|
Definition
Cisco Discovery Protocol Data Link layer n/a n/a |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) HDLC |
|
Definition
High Level Data Link Control Protocol Data Link layer n/a n/a |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) PPP |
|
Definition
Point to Point Protocol Data Link layer n/a n/a |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) ICMP |
|
Definition
Internet Connection Management Protocol Network layer n/a n/a |
|
|
Term
Identify the protocol (full name, OSI layer, port, transport type) ARP / RARP |
|
Definition
(Reverse) Address Resolution Protocol Network layer n/a n/a |
|
|
Term
For a Class A IP address:
What is the first octet range?
What is the high order bits?
What is the default subnet mask? |
|
Definition
First octet range: 1-126
High order bits: 0
Default mask: 255.0.0.0 |
|
|
Term
For a Class B IP address:
What is the first octet range?
What is the high order bits?
What is the default subnet mask? |
|
Definition
First octet range: 128-191
High order bits: 10
Default subnet mask: 255.255.0.0 |
|
|
Term
For a Class C IP address: What is the first octet range? What is the high order bits? What is the default subnet mask? |
|
Definition
First octet range: 192-223 High order bits: 110 Default subnet mask: 255.255.255.0 |
|
|
Term
For a Class D IP address: What is the first octet range? |
|
Definition
First octet range: 224-239 High order bits: 1110 |
|
|
Term
For a Class E IP address: What is the first octet range? What is the high order bits? |
|
Definition
First octet range: 240-255 High order bits: 1111 |
|
|
Term
Name the acronym and briefly describe: CIDR |
|
Definition
Classless Inter-Domain Routing Slash notation expressing the mask separating the network/subnet field and the host field of an IP address. The slash notation is simply the number of consequtive 1's in the subnet mask. |
|
|
Term
| Determine the number of hosts in a /x subnet (excluding subnet zero) |
|
Definition
number of hosts = 2 ^ n - 2 where n = number of 0's in subnet mask = 32 - x |
|
|
Term
What layer do the following device types operate on: Hubs Repeaters Switches Bridges Routers |
|
Definition
Hubs / Repeaters : L1 Switches / Bridges : L2 Routers : L3
|
|
|
Term
| What are three main forms of flow control at layer 4? |
|
Definition
congestion avoidance window size buffering |
|
|
Term
| What does collision detection require for half-duplex links? |
|
Definition
| A loopback circuit for collision detection. |
|
|
Term
| What does the MTU stand for and what does it determine? |
|
Definition
Maximum Transmission Unit Detemines the max size of the packet that can be sent from the specified interface. |
|
|
Term
| What kind of interfaces do/do not show up in the ARP table for a router? |
|
Definition
| Ethernet interfaces (not serial interfaces) |
|
|
Term
| What IP ranges are assigned to private address spaces? |
|
Definition
Class A: 10.0.0.0 / 8 Class B: 172.[16-31].0.0 (172.16.0.0 /10) Class C: 192.168.0.0 / 16 |
|
|
Term
| What are the characteristics of a DHCP Discover message? |
|
Definition
From client to server Broadcast on L2 UDP port 67 |
|
|
Term
| What are the characteristics of a DHCP Offer message? |
|
Definition
From DHCP server to client unicast on L2 UDP port 68 |
|
|
Term
| What does "ip subnet-zero" do? |
|
Definition
Allow usage of the zero subnet. Eg. 1.1.1.0 / 25 1.1.1.0 / 26 etc. |
|
|
Term
| What many bits is an IPv6 address and what is it's formal notation? |
|
Definition
128 bits Hex characters in 8 sets of 4 characters separated by colons. For example: aaaa:bbbb:cccc:dddd:5555:6666:7777:8888 |
|
|
Term
What are the rules that allow shortening of IPv6 addresses? |
|
Definition
leading zeroes can be dropped from a set contiguous groups of all-zero sets can be shortened to a double colon, but only done ONCE eg. 000a:0000:0000:0000:5000:0000:0000:0008 = a:0:0:0:5000::8 |
|
|
Term
| What are the three types of IPv6 traffic? |
|
Definition
unicast multicast anycast (single address assigned to multiple hosts; similar to multicast, except packet is only delivered to the nearest host that fits criteria) |
|
|
Term
| How does the stateless autoconfiguration of IPv6 work? |
|
Definition
dynamic addressing feature that allows host to choose and configure an address for itself host learns the /64 network prefix on the local link, and appends its MAC address |
|
|
