Lets Get Physical
These are the 4 other types of small form-factor pluggable, besides regular "SFP"
SFP+, SFP28, QSFP+, QSFP28
This is the broadcast address for a frame
ffff.ffff.ffff or ff-ff-ff-ff-ff-ff
These are the 4 steps in the DHCP process, and which ones are broadcast?
Discover - Broadcast
Offer - Unicast
Request - Broadcast
Ack - Unicast
Secure Copy Protocol uses what port and what other protocol does it operate with?
22; SSH
This OSI layer comes into play when traffic matches a crypto map for IPSEC
Presentation Layer
The OM designation has 5 levels and applies to this type of cable and determines what capabilities?
Multimode Fiber, OM-1,2,3,4,5; speed over distance
OM-3 supports 40g up to 100M, 100g to 50m
OM-4 40g to 150m, 100g to 100m
What cable type is UDLD used for, and what does it protect against?
Fiber cables; loops
Which part of a packet does a router look at when making a routing decision and what is the first thing it uses when deciding which route to take?
Destination IP address; Most specific route/longest match
In addition to SYN and ACK, what other flags are possible in TCP?
RST - Reset - Abrupt disconnection - can mean an error
PSH - Push - Indicates data being sent
FIN - Finish - Indicates the end of the communication
What is the lowest (least important) level of logging called?
Debug
DAC cables come in these 2 varieties and their primary benefit is what?
Copper aka Twinax or Optical; Cost
Topology Change Notifications are a part of this protocol and are intended to indicate what
Spanning-tree; changes in the network that require a recalibration of port roles and/or states
Which VRF are you referencing if you do a "show ip route"
Default VRF
IP telephony uses the SIP and RTP protocols for this, and are they TCP or UDP?
SIP - Session Initiation Protocol - Used for links between call managers and for setting up the call itself - TCP
RTP - Real-time Transport Protocol - Used for the actual call - UDP
What Cisco product lines (not individual models) support In Service Software Upgrade (ISSU)?
Cat 3850 (with SVL), Cat 9400 (DS), 9500 (SVL), 9600 (DS), N9300
These are the 3 standards of PoE and what differentiates them
PoE - up to 15.4W
PoE+ - up to 30W
PoE++ - Type 3 60W, Type 4 100W
CRC is used for this and errors indicate what?
Ensuring data integrity; physical layer issues, collisions, faulty hardware
Which technology uses a Forwarding Information Base to make routing decisions and which plane does it operate in?
Cisco Express Forwarding (CEF); data plane
What is primary difference in how TACACS handles the payload vs RADIUS?
TACACS encrypts the entire payload, RADIUS only encrypts password
What is an ASIC, and what does it do?
Application Specific Integrated Circuit, Designed speficically for one job, and does that job very well. For us that means switching.
These are the 3 roles within the 802.1x framework and which one does the switch normally perform?
Supplicant, Authenticator(Switch), Authentication Server
A gratuitous ARP message differs from a normal ARP message in what way, and what is the primary reason for it?
Device sends out an ARP message without an ARP request; used for updating an IP address to MAC mapping (i.e. if a NIC is swapped out).
What does Generic Routing Encapsulation add on to a packet?
New IP header, primarily new source and destination IP fields/values
Which layer 4 protocol needs to be enabled on an ACL for a traceroute to be allowed?
ICMP - Internet Control Message Protocol
This command is needed to disable the enable secret requirement when consoling into a switch with a priv 15 account.
aaa authorization console