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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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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 common cabling specifications for Fast Ethernet?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
SVI
Trunk
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

2. What is the DTP negotiation mode of a switch port configured as dynamic?
On
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
The Layer 3 engine

3. Displays a list with status of all interfaces
Institute of Electrical and Electronics Engineers
100 metres
Switch#show interfaces status
LC - MT-RJ or RJ-45

4. What is 1000BASE-ZX?
Switch#show interfaces {interface}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Trunk or dynamic

5. How are ports that are in error-disable state re-enabled by default?
The Layer 3 engine
1000BASE-T full duplex followed by 1000BASE-T half duplex
Manually by administratively disabling and re-enabling the port
Switch(config)#errdisable detect cause gbic-invalid

6. What connectors can be used with SFP modules?
Switch#show ip cef
LC - MT-RJ or RJ-45
Switch(config)#errdisable recovery cause {all | {cause-name}}
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

7. Enables error-disable when trunking encapsulation is flapping from one type to another
SVI or native routed interface
IEEE 802.3z
IEEE 802.3ab
Switch(config)#errdisable detect cause dtp-flap

8. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
100 metres
The adjacency table
Switch(config)#errdisable detect cause gbic-invalid
Process the first packet in a traffic flow to determine the destination

9. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
A name assigned to a ranges of interfaces
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
LC - MT-RJ or RJ-45

10. What is 10GBASE-X?
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause dhcp-rate-limit
The CEF epoch number
SC or MT-RJ

11. What are GigaStack GBICs used for?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
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
Switch(config)#errdisable detect cause {all | {cause-name}}
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

12. How does topology based switching work?
Manually by administratively disabling and re-enabling the port
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
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
American National Standards Institute

13. What is FIB?
Forwarding Information Base
Feature Manager (FM) and Switching Database Manager (SDM)
Value - Mask - and Result (VMR)
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated

14. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
Switch#show ip cef
10 km
The CEF entry version number
70 km for 9 micron SMF; 100 km for 8 micron SMF

15. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#shutdown
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

16. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
FIB with adjacency table
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause bpduguard

17. What tables are maintained by the CEF Layer 3 engine?
Carrier Sense Multiple Access Collision Detection
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Static access or dynamic
Routing table and ARP table

18. What are the default error-disable detection causes?
Enable error-disable for all possible causes
Accelerated CEF (aCEF)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

19. What is the standard for Fast Ethernet (100 Mbps)?
The Drop adjacency
Switch#show errdisable recovery
IEEE 802.3u
IEEE 802.3

20. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The Layer 3 engine

21. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Electromagnetic Interference
LAN PHY and WAN PHY
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
American National Standards Institute

22. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause psecure-violation
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#errdisable recovery interval {seconds}

23. What function is performed by the Switching Database Manager (SDM)?
Switch(config)#errdisable detect cause udld
Switch(config)#mac address-table aging-time {seconds}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
The Discard adjacency

24. What is the TCAM Value and Mask for an ICMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Cabling specifications for Gigabit Ethernet
Numeric values that represent what action to take after the TCAM lookup occurs
FIB with adjacency table

25. Enables error-disable for when the port link state is flapping between the up and down states
Packets that have been truncated before they were fully received
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 vmps
Switch(config)#errdisable detect cause link-flap

26. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause l2ptguard
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch#show cef not-cef-switched
Half duplex

27. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
15 metres
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
SC or MT-RJ
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

28. Enables error-disable for errors related to 802.1x security
Switch(config)#errdisable detect cause rootguard
Switch(config)#errdisable detect cause security-violation
LOU registers
The Layer 3 engine

29. Selects a switch port interface and enters interface configuration mode
Switch(config)#interface {type}{module}/{number}
The Layer 3 forwarding engine
Creating the VLAN
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

30. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
SVI
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

31. Displays a list of all interfaces in an error-disabled state
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause vmps
The Layer 3 engine
Switch#show interfaces status err-disabled

32. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Switch(config)#errdisable detect cause pagp-flap
Tunnel
Switch(config-if)#switchport mode access

33. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch(config)#errdisable detect cause dtp-flap
IEEE 802.3ae
Switch(config)#errdisable detect cause vmps
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

34. What is CSMA/CD?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
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)
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause storm-control

35. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Switch#show cef not-cef-switched
In TCAM Value entries
The Drop adjacency
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

36. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
Switch#show interfaces status err-disabled
Half duplex
400 metres half duplex and 2000 metres full duplex
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

37. What is 10GBASE-LR/LW?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause arp-inspection

38. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch#show cef drop
Switch(config)#errdisable detect cause vmps
Accelerated CEF (aCEF)
Switch(config-if)#shutdown

39. What is the default duplex mode of a Gigabit Ethernet interface?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Tunnel
Full duplex
Switch(config)#errdisable detect cause bpduguard

40. What is the name of the CEF engine that maintains routing information in software?
By Mask/Value - where each unique mask has eight value patterns associated with it
Cisco Express Forwarding
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
The Layer 3 engine

41. What is TCAM?
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
Ternary Content-Addressable Memory
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause gbic-invalid

42. What is ANSI?
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#interface {type}{module}/{number}
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
American National Standards Institute

43. Disables a switch port
Switch(config)#default interface {interface}
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config-if)#shutdown
On

44. What is 100BASE-T2?
Switch(config-if)#switchport mode access
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch(config)#errdisable detect cause {all | {cause-name}}

45. How do Layer 2 switches provide isolation between hosts?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

46. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Compiling Access Control Entries (ACE) into the TCAM table
10 km
Process the first packet in a traffic flow to determine the destination
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

47. What is the role of a Switch Engine (SE) in first generation MLS?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#errdisable detect cause security-violation
In parallel revealing the best (longest) match in a single table lookup
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

48. What is the maximum cabling distance for 1000BASE-LX/LH?
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
CEF glean
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
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

49. What tables are maintained by the CEF Layer 3 forwarding engine?
LAN PHY and WAN PHY
FIB with adjacency table
Institute of Electrical and Electronics Engineers
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

50. Displays error-disabled recovery timer information
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show errdisable recovery
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3ae