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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. Selects an interface-range macro and enters interface configuration mode
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#interface range macro {name}
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

2. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config-if)#no switchport
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Configure the appropriate values manually on both ends of the link

3. What is the maximum cabling distance for 10GBASE-CX4?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show interfaces status err-disabled
15 metres

4. Enables error-disable for conditions that trigger port security configured on a port
They are dropped (ARP throttling)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
CEF punt
Switch(config)#errdisable detect cause psecure-violation

5. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
Switch(config)#no ip cef
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
ANSI X3T11 FibreChannel

6. Enables error-disable when a storm control threshold has been exceeded on a port
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
Switch(config)#errdisable detect cause storm-control
Switch(config)#interface vlan {vlan-id}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

7. What information is recorded in CAM as frames arrive on a switch port?
Source MAC address; Port of arrival; VLAN; Time stamp
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
When one station transmits at the same time as another on a shared medium
By Mask/Value - where each unique mask has eight value patterns associated with it

8. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
IEEE 802.3
Packets that have been truncated before they were fully received
Static access or trunk

9. What are the reasons for packets being punted by CEF?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show cef not-cef-switched
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
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

10. What is unknown unicast flooding?
Switch(config)#errdisable detect cause bpduguard
Configure the appropriate values manually on both ends of the link
Half duplex
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

11. What is the maximum cabling distance for 1000BASE-CX?
25 metres
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show adjacency [{interface}] [summary | detail]
Switch#show interfaces status

12. What is the standard for Gigabit Ethernet (1000 Mbps)?
40 km
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
IEEE 802.3z
Numeric values that represent what action to take after the TCAM lookup occurs

13. What is the TCAM Value and Mask for an IPX access list?
Accelerated CEF (aCEF)
UTP Fast Ethernet and Gigabit Ethernet
Only temporarily for debugging purposes
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

14. What is the maximum cabling distance for 1000BASE-LX/LH?
From 30 seconds to 86 -400 seconds (24 hours)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

15. What is EMI?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Electromagnetic Interference
Switched virtual interface (SVI)
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

16. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config-if)#switchport access vlan {vlan}
On
Source MAC address; Port of arrival; VLAN; Time stamp

17. Enables error-disable detection
10GbE operates only at full duplex
Routing table and ARP table
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable detect cause {all | {cause-name}}

18. What is a GigaStack GBIC?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#interface range macro {name}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

19. What is the standard for Fast Ethernet (100 Mbps)?
UTP Fast Ethernet and Gigabit Ethernet
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
IEEE 802.3u

20. What is CEF?
Cisco Express Forwarding
Down - static access - trunk or tunnel
IEEE 802.3ab
Switch#show ip cef

21. Configures the maximum ageing time for entries in the MAC address table
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#mac address-table aging-time {seconds}
Half duplex
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

22. What is the original standard for Ethernet (10 Mbps)?
Switch#show interfaces status
IEEE 802.3
Switch(config)#no ip cef
40 km

23. What is the maximum cabling distance for 10GBASE-LX4/LW4?
IEEE 802.3ae
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switched virtual interface (SVI)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

24. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Accelerated CEF (aCEF)
Forwarding Information Base
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
On

25. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Tunnel
Cabling specifications for Gigabit Ethernet

26. What are GigaStack GBICs used for?
Switch#show adjacency [{interface}] [summary | detail]
Creating the VLAN
IEEE 802.3ae
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

27. What is 10GBASE-LX4/LW4?
XENPAK - X2 - or SFP+
Switch#show errdisable recovery
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

28. What is the role of a Route Processor (RP) in first generation MLS?
Institute of Electrical and Electronics Engineers
LAN PHY and WAN PHY
Cisco Express Forwarding
Process the first packet in a traffic flow to determine the destination

29. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Numeric values that represent what action to take after the TCAM lookup occurs
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

30. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
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
Configure the appropriate values manually on both ends of the link

31. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config)#errdisable detect cause l2ptguard
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
By Mask/Value - where each unique mask has eight value patterns associated with it

32. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Numeric values that represent what action to take after the TCAM lookup occurs
LOU registers
Switch(config)#errdisable detect cause pagp-flap
Ternary Content-Addressable Memory

33. What are the Gigabit Ethernet autonegotiation selection priorities?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Compiling Access Control Entries (ACE) into the TCAM table
Collision domain
1000BASE-T full duplex followed by 1000BASE-T half duplex

34. Displays CEF Drop statistics with number of packets and reason for each line card
100 metres
Multilayer Switching
Switch#show cef drop
The Null adjacency

35. What two IOS software components are involved in TCAM operation?
Feature Manager (FM) and Switching Database Manager (SDM)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Ternary Content-Addressable Memory
Collision domain

36. Enables error-disable for errors with dynamic ARP inspection
In parallel revealing the best (longest) match in a single table lookup
SVI or native routed interface
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch(config)#errdisable detect cause arp-inspection

37. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
The adjacency table
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
S = Short; L = Long; E = Extra-long

38. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
The Layer 3 forwarding engine
In TCAM Value entries
Switch(config)#mac address-table aging-time {seconds}
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

39. Displays the contents of the CAM table
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause loopback
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause dtp-flap

40. When do collisions occur?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
When one station transmits at the same time as another on a shared medium
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
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)

41. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
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
Switch(config)#errdisable detect cause pagp-flap
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

42. Displays a list of all interfaces in an error-disabled state
The switch port falls back to default setting of half duplex
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch#show interfaces status err-disabled
The Null adjacency

43. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
300 seconds
10GbE operates only at full duplex

44. What is the DTP negotiation mode of a switch port configured as dynamic?
A station must wait its turn to transmit; it can't transmit and receive at the same time
On
Accelerated CEF (aCEF)
Full duplex

45. What is 10GBASE-X?
The Null adjacency
Cabling specifications for 10 Gigabit Ethernet
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
Tunnel

46. What is 10GBASE-CX4?
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-if)#speed {10 | 100 | 1000 | auto}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

47. What tables are maintained by the CEF Layer 3 forwarding engine?
Switch(config-if)#no switchport
FIB with adjacency table
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause bpduguard

48. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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49. Selects a switch port interface and enters interface configuration mode
Switch(config)#default interface {interface}
Switch(config)#interface {type}{module}/{number}
Switch(config)#interface range macro {name}
Numeric values that represent what action to take after the TCAM lookup occurs

50. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Switch#show interfaces {interface}
S = Short; L = Long; E = Extra-long
Switch#show cef drop
The adjacency table