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39 Cards in this Set
- Front
- Back
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5 DHCP Benefits |
Centralized admin of IPs Dynamic host config Seamless IP config Flexibility Scalability |
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True or false: DHCP reservations must be created within the scope of the DHCP pool |
True |
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What problem will occur if not properly set when using DHCP? |
Duplex/speed mismatch. Must be the same on both devices. |
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2 types of broadcast |
Directed Limited |
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Define directed broadcast |
All host bits are 1 Routable |
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Define limited broadcast |
All bits are 1 Not routable |
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Ethernet MAC broadcast? |
All Fs |
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What command brings up ARP cache table |
ARP -a |
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What is the point of IP multicast routing |
Conserve bandwidth of IP nets |
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What class of address range is reserved for multicast addresses? |
Class D 224.0.0.0 to 239.255.255.255 |
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What are the 3 multicast address types and their ranges |
Reserved link local 224.0.0.0-224.0.0.255 Globally scoped 224.0.1.0-238.255.255.255 Administratively scoped 239.0.0.0-239.255.255.255 |
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Define reserved link local |
TTL=1 Non routable |
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Define globally scoped |
Has reserved addresses for internet services. 224.0.1.1 is NTP |
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Define Administratively scoped |
Constrained to a local group or org Used within the LAN only |
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What is the multicast prefix for layer 2 |
01-00-5E |
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How many bits of the IP are translated into the multicast MAC |
The lower 23 |
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What is IGMP |
Dynamically register multicast hosts. They identify group members by sending IGMP messages. |
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What is the default behavior of a switch when it receives multicast traffic? What stops this behavior? |
Port flooding CGMP, IGMP Snooping |
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Name 6 common network protocols |
ICMP Telnet FTP/TFTP HTTP/HTTPS STMP/POP3/IMAP |
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What is ICMP |
Mechanism where special events are reported. Mode of device testing Foundation for Packet Internet Groping (ping). |
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What is the Telnet port number |
23 |
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What are FTP and TFTP |
FTP uses TCP which acks data. TFTP uses UDP, no data Ack. Port 20 = data tx Port 21 = control info |
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Define BOOTP |
Shitty version of DHCP. All individual settings must be set for individual workstations manually. Preconfigured clients. |
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Define SMTP |
Protocol for email transfer |
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Define POP3/IMAP |
POP3: locally administered received email IMAP: remotely administered |
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what are the 4 main fields of TCP header |
Source port Dest port Seq # Ack # |
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4 main fields of UDP header? |
Source/Dest port Length/checksum |
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Port numbers below what are used for widely used apps |
1024 |
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What is a proxy |
An intermediary program that acts as a server and client |
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3 scenarios to use a proxy |
Security intermediary Different versions of http Increased bandwidth |
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What is a firewall |
Device between network and internet designed to forward some packets and filter others |
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What can a proxy firewall do that a packet filter firewall can't |
Filter up to the application layer, such as HTTP |
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What do you call encryption and decryption algorithms |
Cipher |
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What is a set of numbers that a cypher operates on |
Key |
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What are the 2 ciphers |
Symmetric key Assymetric key |
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Define symmetric key |
Same key used by both sides Can be intercepted/decoded |
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Define assymetric key |
Has 2 keys, private and public Public key to send info, private keys to decrypt it Ex: PKI |
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Define pub key |
Digital signature ensuring data is indeed being sent from the sender |
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Define pub key |
Digital signature ensuring data is indeed being sent from the sender |
