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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Displays error-disabled detection status
On
The Layer 3 forwarding engine
Switch#show errdisable detect
Wide-Wavelength Division Multiplexing

2. What is the content of TCAM Result entries?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Numeric values that represent what action to take after the TCAM lookup occurs
Collision domain
The table of learned MAC addresses - ports - and VLAN information

3. What is WWDM?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
IEEE 802.3u
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Wide-Wavelength Division Multiplexing

4. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Switch#show interfaces status err-disabled
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
The Drop adjacency
In TCAM Value entries

5. What is the maximum cabling distance for 1000BASE-LX/LH?
70 km for 9 micron SMF; 100 km for 8 micron SMF
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Security and QoS ACLs
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

6. What Ethernet ports allow for autonegotiation?
XENPAK - X2 - or SFP+
In parallel revealing the best (longest) match in a single table lookup
UTP Fast Ethernet and Gigabit Ethernet
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed

7. What is the DTP negotiation mode of a switch port configured as dynamic?
On
Manually by administratively disabling and re-enabling the port
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable recovery cause {all | {cause-name}}

8. What is 100BASE-FX?
Multilayer Switching
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Static access
FIB with adjacency table

9. What is the name of the CEF engine that maintains routing information in software?
Switch(config)#no ip cef
The Layer 3 engine
Full duplex
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

10. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show ip cef {interface} [detail]

11. What is a SVI?
Switched virtual interface (SVI)
ANSI X3T11 FibreChannel
Switch#show ip cef
Store-and-forward

12. Displays error-disabled recovery timer information
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Half duplex
IEEE 802.3u
Switch#show errdisable recovery

13. What is the default duplex mode of a Fast Ethernet interface?
Half duplex
Switch(config-if)#description {string}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Forwarding Information Base

14. What information is stored in TCAM?
Security and QoS ACLs
Collision domain
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Compiling Access Control Entries (ACE) into the TCAM table

15. What is 100BASE-T4?
Switch(config-if)#switchport access vlan {vlan}
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show cef not-cef-switched

16. What is 100BASE-TX?
Slow response times - low throughput - runts and other input errors on the switch ports
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config-if)#switchport mode access
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

17. What connectors can be used with SFP modules?
LC - MT-RJ or RJ-45
Static access - trunk - tunnel or dynamic
Switch(config-if)#shutdown
Off

18. What is the maximum cabling distance for 10GBASE-LX4/LW4?
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
100 metres
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

19. What are the Fast Ethernet autonegotiation selection priorities?
IEEE 802.3ae
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch#show interfaces status err-disabled
On

20. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
Switch#show running-config interface {interface}
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
The Drop adjacency

21. What CEF adjacency is used to switch packets destined for the null interface?
Switch(config-if)#no switchport
The Null adjacency
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Static access or trunk

22. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Switch(config-if)#no switchport
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Configure the appropriate values manually on both ends of the link
Switch(config)#interface {type}{module}/{number}

23. What are runts?
IEEE 802.3ae
Packets that have been truncated before they were fully received
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Static access - trunk - tunnel or dynamic

24. What is the timer range for automatic re-enabling of error-disabled ports?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config-if)#no ip route-cache cef
SC or MT-RJ

25. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Trunk or dynamic
In parallel revealing the best (longest) match in a single table lookup
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end

26. What is error-disable state?
A switch port that has been shut down automatically due to a serious error condition
400 metres half duplex and 2000 metres full duplex
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Only temporarily for debugging purposes

27. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Feature Manager (FM) and Switching Database Manager (SDM)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
CEF punt
Trunk or dynamic

28. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
LOU registers
Logical Operation Unit
Down - static access - trunk or tunnel
Switch(config-if)#speed {10 | 100 | 1000 | auto}

29. What is 1000BASE-T?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
R = LAN PHY; W = WAN PHY
Institute of Electrical and Electronics Engineers
25 metres

30. Selects an interface-range macro and enters interface configuration mode
LAN PHY and WAN PHY
Switch(config)#interface range macro {name}
The CEF entry version number
25 metres

31. Enables error-disable for rate-limiting of DHCP snooping
Switched virtual interface (SVI)
LAN PHY and WAN PHY
Switch(config)#errdisable detect cause dhcp-rate-limit
The Discard adjacency

32. What are the types of layer 3 switched interfaces
Switch(config)#errdisable detect cause ilpower
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Institute of Electrical and Electronics Engineers
SVI or native routed interface

33. What is a ternary combination?

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34. What is the maximum cabling distance for 10GBASE-LR/LW?
With a mask value in addition to binary values to decide which keys in a table are relevant
1 -2 on one end with 3 -6 on the other end
10 km
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

35. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch(config)#errdisable detect cause channel-misconfig
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

36. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Cabling specifications for 10 Gigabit Ethernet

37. Displays the entire Forwarding Information Base (FIB)
Switch(config-if)#description {string}
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show ip cef
Switch#show adjacency [{interface}] [summary | detail]

38. What is 10GBASE-CX4?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
A switch port that has been shut down automatically due to a serious error condition
LOU registers
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

39. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
A three-fold combination of 0 - 1 and X (don't care)
Switch#show adjacency [{interface}] [summary | detail]
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets

40. How are the TCAM Mask/Value pairs evaluated?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
S = Short; L = Long; E = Extra-long
In parallel revealing the best (longest) match in a single table lookup
10 km

41. What is MLS?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Multilayer Switching
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

42. What is Fast EtherChannel (FEC)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#errdisable detect cause unicast-flood
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
When one station transmits at the same time as another on a shared medium

43. How are ports that are in error-disable state re-enabled by default?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Manually by administratively disabling and re-enabling the port
Switch(config-if)#switchport mode access
IEEE 802.3ab

44. What is the standard for Gigabit Ethernet (1000 Mbps)?
IEEE 802.3z
Wide-Wavelength Division Multiplexing
100 metres
Switch#show interfaces {interface} switchport

45. What is EMI?
Electromagnetic Interference
Switch(config)#errdisable detect cause loopback
Switch(config)#errdisable recovery interval {seconds}
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

46. What is the administrative mode of a switch port that is a member of one VLAN?
Switched virtual interface (SVI)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config)#errdisable detect cause loopback
Static access or dynamic

47. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause ilpower
10GbE operates only at full duplex
Compiling Access Control Entries (ACE) into the TCAM table

48. How is the TCAM organised?
Enable error-disable for all possible causes
1 -2 on one end with 3 -6 on the other end
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
By Mask/Value - where each unique mask has eight value patterns associated with it

49. What are the Gigabit Ethernet autonegotiation selection priorities?
Off
Switch(config)#errdisable detect cause ilpower
Source MAC address; Port of arrival; VLAN; Time stamp
1000BASE-T full duplex followed by 1000BASE-T half duplex

50. Enables error-disable when a storm control threshold has been exceeded on a port
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause storm-control
Value - Mask - and Result (VMR)
Switched virtual interface (SVI)