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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. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch(config)#errdisable detect cause ilpower
Forwarding Information Base
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
S = Short; L = Long; E = Extra-long

2. What is the default age-out time for stale entries in the CAM table?
Content-Addressable Memory
Switch(config)#default interface {interface}
300 seconds
Manually by administratively disabling and re-enabling the port

3. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
ANSI X3T11 FibreChannel
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch#show interfaces {interface}

4. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
Enable error-disable for all possible causes
Logical Operation Unit
Full duplex only

5. What is CEF?
Cisco Express Forwarding
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
300 seconds
Tunnel

6. What is the operational mode of a switch port that is a member of one VLAN?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
40 km
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Static access

7. What is error-disable state?
A three-fold combination of 0 - 1 and X (don't care)
A switch port that has been shut down automatically due to a serious error condition
Static access - trunk - tunnel or dynamic
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

8. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch#show interfaces {interface}
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
The CEF epoch number
Switch(config-if)#speed {10 | 100 | 1000 | auto}

9. Displays the contents of the CAM table
40 km
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
1 -2 on one end with 3 -6 on the other end
Switch(config)#errdisable detect cause arp-inspection

10. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
Trunk or dynamic
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#errdisable detect cause security-violation

11. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Electromagnetic Interference
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Full duplex only
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

12. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Feature Manager (FM) and Switching Database Manager (SDM)
From 30 seconds to 86 -400 seconds (24 hours)

13. What is the TCAM Value and Mask for an Ethernet access list?
American National Standards Institute
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
300 seconds
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

14. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
Route caching and topology based
Switch(config-if)#switchport access vlan {vlan}
The Punt adjacency

15. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
The Discard adjacency
On
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
XENPAK - X2 - or SFP+

16. What CEF adjacency is used to switch packets that can't be forwarded normally?
The Drop adjacency
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#mac address-table aging-time {seconds}

17. What is 1000BASE-ZX?
Switch(config)#interface vlan {vlan-id}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#errdisable detect cause loopback
Switch(config)#no ip cef

18. Displays the entire Forwarding Information Base (FIB)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show ip cef
Switch(config)#interface range macro {name}
Route caching and topology based

19. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
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)
The table of learned MAC addresses - ports - and VLAN information

20. What is the maximum cabling distance for 1000BASE-CX?
Enable error-disable for all possible causes
A station must wait its turn to transmit; it can't transmit and receive at the same time
Electromagnetic Interference
25 metres

21. What are the reasons for packets being punted by CEF?
A switch port that has been shut down automatically due to a serious error condition
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause link-flap

22. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Configure the appropriate values manually on both ends of the link
XENPAK - X2 - or SFP+
Switch(config)#errdisable detect cause pagp-flap
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

23. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
When one station transmits at the same time as another on a shared medium
Creating the VLAN
Switch(config)#errdisable detect cause l2ptguard

24. Enables error-disable for errors related to 802.1x security
300 seconds
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show ip cef
Switch(config)#errdisable detect cause security-violation

25. What is the name of a Layer 3 physical interface on a switch?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
LAN PHY and WAN PHY
Native routed interface
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

26. What is an interface-range macro?
LC - MT-RJ or RJ-45
A name assigned to a ranges of interfaces
The table of learned MAC addresses - ports - and VLAN information
In parallel revealing the best (longest) match in a single table lookup

27. What is 1000BASE-LX/LH?
Switch(config)#errdisable detect cause rootguard
Dynamic
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
From 30 seconds to 86 -400 seconds (24 hours)

28. What is the default timer for automatic re-enabling of error-disabled ports?
300 seconds
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch#show interfaces status err-disabled
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

29. Displays a list of all interfaces in an error-disabled state
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show interfaces status err-disabled
Trunk or dynamic
Switch#show errdisable detect

30. What is the default duplex mode of a Gigabit Ethernet interface?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Full duplex

31. Enables error-disable for conditions that trigger port security configured on a port
Collision domain
Compiling Access Control Entries (ACE) into the TCAM table
Switch#show interfaces status err-disabled
Switch(config)#errdisable detect cause psecure-violation

32. What is the standard for 10 Gigabit Ethernet (10GbE)?
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
IEEE 802.3ae
CEF glean
Dynamic

33. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
Off
100 metres
S = Short; L = Long; E = Extra-long

34. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Switch(config)#mac address-table aging-time {seconds}
Switch(config-if)#no ip route-cache cef
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
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

35. What is the role of a Switch Engine (SE) in first generation MLS?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause bpduguard

36. What is the role of a Route Processor (RP) in first generation MLS?
The Null adjacency
Trunk
Static access
Process the first packet in a traffic flow to determine the destination

37. What combinations are TCAM entries composed of?
Switch(config)#mac address-table aging-time {seconds}
Value - Mask - and Result (VMR)
Forwarding Information Base
Cabling specifications for Gigabit Ethernet

38. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
40 km
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Trunk or dynamic

39. What is 1000BASE-SX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
IEEE 802.3ae
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
A name assigned to a ranges of interfaces

40. What is the operational mode of a switch port that uses DTP negotiation?
Switch(config)#errdisable detect cause psecure-violation
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Static access or trunk
Switch(config)#errdisable detect cause gbic-invalid

41. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
400 metres half duplex and 2000 metres full duplex
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch#show adjacency [{interface}] [summary | detail]

42. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
Cisco Express Forwarding
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
IEEE 802.3u

43. What CEF optimisation replicates the entire FIB table among switch line cards?
The Null adjacency
Distributed CEF (dCEF)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
The CEF entry version number

44. What is the operational mode of a switch port that carries traffic for multiple VLANs?
UTP Fast Ethernet and Gigabit Ethernet
Only temporarily for debugging purposes
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Trunk

45. Configures a switch port with a static access VLAN assignment
A station must wait its turn to transmit; it can't transmit and receive at the same time
The CEF entry version number
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config-if)#switchport access vlan {vlan}

46. What are the names of the two basic generations of MLS?
IEEE 802.3u
Route caching and topology based
IEEE 802.3z
Switch#show errdisable recovery

47. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause unicast-flood
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

48. What is 100BASE-T2?
The Layer 3 forwarding engine
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Electromagnetic Interference
On

49. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch(config)#errdisable detect cause bpduguard
10GbE operates only at full duplex
The Punt adjacency
Switch(config-if)#switchport access vlan {vlan}

50. What is FIB?
Switch#show running-config interface {interface}
Forwarding Information Base
FIB with adjacency table
25 metres