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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 is the administrative mode of a switch port that carries traffic for multiple VLANs?
Switch(config)#errdisable detect cause unicast-flood
Only temporarily for debugging purposes
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
Trunk or dynamic

2. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
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 recovery cause {all | {cause-name}}
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Tunnel

3. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
Switch(config)#errdisable detect cause security-violation
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
IEEE 802.3u

4. What is half duplex operation?

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5. How do Layer 2 switches provide isolation between hosts?
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#show ip cef {network} [{mask}] [longer-prefixes] [detail]
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

6. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
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
XENPAK - X2 - or SFP+
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause rootguard

7. What is 1000BASE-ZX?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#errdisable detect cause l2ptguard
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Manually by administratively disabling and re-enabling the port

8. Enables error-disable when an interface has been looped back
On
In parallel revealing the best (longest) match in a single table lookup
FIB with adjacency table
Switch(config)#errdisable detect cause loopback

9. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
70 km for 9 micron SMF; 100 km for 8 micron SMF
Source MAC address; Port of arrival; VLAN; Time stamp
Partition and tune the TCAM on some Catalyst switches into areas for different functions

10. What is TCAM overflow?
Content-Addressable Memory
The Drop adjacency
Switch(config)#default interface {interface}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

11. What is the DTP negotiation mode of a switch port configured as trunk?
Switch#show interfaces {interface} switchport
On
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#no ip cef

12. What tables are maintained by the CEF Layer 3 engine?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Routing table and ARP table

13. What happens to subsequent packets destined for FIB entries in CEF glean state?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause {all | {cause-name}}
The Drop adjacency

14. Configures the maximum ageing time for entries in the MAC address table
Switch(config)#no ip cef
Switch(config)#mac address-table aging-time {seconds}
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
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

15. What is the maximum cabling distance for 10GBASE-CX4?
IEEE 802.3z
15 metres
Process the first packet in a traffic flow to determine the destination
300 seconds

16. What is CAM?
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
American National Standards Institute
Content-Addressable Memory
Switch(config-if)#shutdown

17. Displays administrative and operational status for a specified interface
The Null adjacency
SVI
Institute of Electrical and Electronics Engineers
Switch#show interfaces {interface}

18. Displays the contents of the CAM table
Switch(config)#errdisable detect cause psecure-violation
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#default interface {interface}

19. Displays CEF Punt statistics with number of packets and reason for each line card
Full duplex only
In TCAM Value entries
Enable error-disable for all possible causes
Switch#show cef not-cef-switched

20. How is the TCAM organised?
Switch(config)#errdisable detect cause psecure-violation
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
By Mask/Value - where each unique mask has eight value patterns associated with it
The Layer 3 forwarding engine

21. Disables a switch port
Switch(config)#default interface {interface}
IEEE 802.3u
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config-if)#shutdown

22. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config)#mac address-table aging-time {seconds}
The Drop adjacency
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config-if)#speed {10 | 100 | 1000 | auto}

23. Sets the duplex mode of an Ethernet or Fast Ethernet interface
CEF punt
Switch(config-if)#duplex {auto | full | half}
SVI or native routed interface
By Mask/Value - where each unique mask has eight value patterns associated with it

24. What is the standard for Gigabit Ethernet (1000 Mbps)?
LOU registers
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#interface vlan {vlan-id}
IEEE 802.3z

25. What tables are maintained by the CEF Layer 3 forwarding engine?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
SVI
FIB with adjacency table

26. Enables error-disable for when the port link state is flapping between the up and down states
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause link-flap
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

27. Displays a list with status of all interfaces
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Half duplex
Switch#show interfaces status
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

28. What information is recorded in CAM as frames arrive on a switch port?
Source MAC address; Port of arrival; VLAN; Time stamp
15 metres
Dynamic
Switch(config)#interface {type}{module}/{number}

29. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
The Drop adjacency
ANSI X3T11 FibreChannel

30. What is WAN PHY used for?
Switch(config)#errdisable detect cause arp-inspection
The Drop adjacency
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config-if)#no switchport

31. Displays dynamic CAM table entries
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Route caching and topology based
LAN PHY and WAN PHY
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

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

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33. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
R = LAN PHY; W = WAN PHY
1000BASE-T full duplex followed by 1000BASE-T half duplex
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

34. What is the standard for 1000BASE-T?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
IEEE 802.3ab
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

35. What is the DTP negotiation mode of a switch port configured as dynamic?
The CEF entry version number
Switch(config)#errdisable detect cause dtp-flap
On
Switch(config)#errdisable detect cause unicast-flood

36. What are the types of layer 3 switched interfaces
Cabling specifications for 10 Gigabit Ethernet
SVI or native routed interface
Full duplex only
Only temporarily for debugging purposes

37. What CEF optimisation replicates the entire FIB table among switch line cards?
Half duplex
Distributed CEF (dCEF)
When one station transmits at the same time as another on a shared medium
Trunk

38. Selects a switch port interface and enters interface configuration mode
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#interface {type}{module}/{number}
Dynamic
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

39. When can a switch start to learn source MAC addresses on incoming ports?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Collision domain
Compiling Access Control Entries (ACE) into the TCAM table

40. What two IOS software components are involved in TCAM operation?
Switch#show adjacency [{interface}] [summary | detail]
Feature Manager (FM) and Switching Database Manager (SDM)
Static access - trunk - tunnel or dynamic
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

41. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
10 km
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable recovery cause {all | {cause-name}}

42. What is the content of TCAM Mask entries?

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43. What is the standard for Fast Ethernet (100 Mbps)?
LC - MT-RJ or RJ-45
10 km
Cabling specifications for 10 Gigabit Ethernet
IEEE 802.3u

44. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Multilayer Switching
Switch(config)#interface range macro {name}
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Native routed interface

45. What are the Gigabit Ethernet autonegotiation selection priorities?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch#show errdisable recovery

46. What is the TCAM Value and Mask for an IGMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
10GbE operates only at full duplex
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

47. Displays the entire Forwarding Information Base (FIB)
Switch#show ip cef
Process the first packet in a traffic flow to determine the destination
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Trunk or dynamic

48. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
Switch(config-if)#shutdown
A name assigned to a ranges of interfaces
10GbE operates only at full duplex

49. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause vmps
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Routing table and ARP table

50. What is 100BASE-T2?
Switch(config)#errdisable detect cause ilpower
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Routing table and ARP table
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP