Infrastructure Flashcards
OSPF Maximum Number of load balanced paths
16
OSPF Default number of load balanced paths
4
Is an ARP table in the data plane?
No - it is in the control plane
What plane is the FIB and Adjacency Table in?
Data plane
In RSTP what RSTP states are referred to as “Blocking”
Blocking
Disabled
Listening
What additional information would be needed to capture data?
Goto individual interface and enter ip flow ingress or ip flow egress
In VTP Pruning can VLAN 1 be pruned?
no
WHat is VTP Pruning
Using CDP the device knows what VLAN’s are allowed on the neighbouring interface and then stops VLAN broadcasting to that device
What is the benefit of VTP Pruning
Reduces unnecessary broadcasts
What method enables improved (Detailed) IP SLA info?
COnfigure ip sla responder on destionation router
What command is used to configure Port-ACL’s
ip access-group
What EIGRP K values are enabled by default?
K1 and K3
EIGRP formula
EIGRP classic v wide
- 32-bit v 64 bit
EIGRP WIde formula
Command to enable BPDU Guard on all PortFast ports?
spanning-tree portfast bpduguard defualt
If a port in an PortChannel is made so it is not compatible with another port, what happens?
Port is Suspended
Port is disabled
Does HSRP support millisecond timers?
Yes
HSRP requires layer _ connectivity between routers.
2
HSRP states
Initial
Listen
Speak
Standby
Active
HSRP - Initial
HSRP doesn’t run. This state is seen when an interface comes up
HSRP - Listen
listens for hellos, knows the virtual IP
HSRP - Speak
sends hellos and participates in the election
HSRP - Standby
candidate for next active router
HSRP - Active
currently forwards packets sent to the virtual IP
It’s important that the HSRP Active router is also the _________ in order to avoid suboptimal path
spanning tree root
Command to set HSRP timers in milliseconds
DSW1(config-if)#standby 1 timers msec 200 msec 600
With the command:
standby <number> track <Interface>
What happens?</Interface></number>
If interface goes down, HSRP group priority is decreased by 50
HSRP preempt delay time - which should this be timed to?
The preempt delay has been kept at 60 but Cisco recommends timing the switch boot time and setting the delay value accordingly.
In HSRP, if a router is not an Active ro Standby router - what state are they in?
Listen
HSRP - how many routers can be in the active and standby state?
1 - one for each state
Way to remember HSRP states
I shall
Learn
Standby
Systems
Anxiously
HSRPv1 port number
1985
HSRPv1 group address
0000.0c07.acXX (XX = group number)
HSRPv2 group address
0000.0c9f.fxxx (XXX = group number)
HSRPv2 port number
1985
HSRP for IPv6 (HSRPv2) port number
2029
HSRP for IPv6 Link Local address
FF02::66
Where are these mac addresses sued
MAC 0005.73A0.000 – 0005.73A0.0FFF (4096 addresses)
HSRP for IPv6 MAC address
MAC 0005.73A0.000 – 0005.73A0.0FFF (4096 addresses)
Do Router and network LSA’s carry IP information in OPSFv3?
No - just express topology
Role of OSPFv3 Type 8 LSA
Link LSA
contain information just about the link-local IPv6 prefixes
Role of OSPFv3 Type 9 LSA
Intra-area-prefix LSA
Carry address information
Essentially the prefix info previously carried in Router/Network LSA is now split into a type 9
What was OSPFv2 Summary LSA and ASBR SUmmary LSA renamed t
Type 3 - Interarea-prefix SLA’s
Type 4 - Interarea-router LSA’s
CEF - what are the two available types of balancing?
Per Destination
Per-Packet
CEF - what are the types of algorithm avaliable?
- Original
- Universal
- Tunnel
- Include Ports
CEF default algorithm
Universal
CEF command to configure balancing type
ip load-sharing per-destination OR ip load-sharing per-destination
CEF command to configure algorithm type
ip cef load-sharing algorithm
CEF - Per-destination v Per-Packet advantages and diadvantages
- Per-Packet less affected by lots of similar src-dest flows
- Per-Packet can deliver packets in the wrong order
In OSPF what is elected first - the BDR or the DR
BDR
What protocol number is used for GRE
47
What is TCP’s default segment size
536
User Level 0 privilages
Is Telnet avalaible to Level 1 users?
Yes
When would you see the following STP error message?
ACL numbers requried for MAC ACL
700-799
What direction can MAC ACL’s be applied
Inwards only
ACL numbers required for Internetwork packet exchange
800-899
Syslog Port Number
514
Type 5 Password Type
MD5
Type 7 Password Type
Vigenere
Type 4 Password Type
SHA-256
Type 8 Password Type
PBKDF2 with SHA-256
Type 9 Password Type
scrypt
GRE Protocol Number
47
UDP Protocol Number
17
ICMP Protocol Number
1
ICMP Protocol Number
1
Local Preference - higher or lower preferred?
Higher
Local Preference default value
100
