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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 administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
On
Distributed CEF (dCEF)

2. What is the maximum cabling distance for 10GBASE-CX4?
Switch(config)#errdisable detect cause unicast-flood
Static access
15 metres
Security and QoS ACLs

3. What is the maximum cabling distance for 10GBASE-ER/EW?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config-if)#speed {10 | 100 | 1000 | auto}
40 km
Switch#show ip cef

4. Specifies the timer for automatic re-enabling of error-disabled ports
Static access - trunk - tunnel or dynamic
R = LAN PHY; W = WAN PHY
300 seconds
Switch(config)#errdisable recovery interval {seconds}

5. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
SC or MT-RJ
Switch(config-if)#switchport mode access
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
Static access

6. Enables error-disable for conditions that trigger port security configured on a port
Routing table and ARP table
A switch port that has been shut down automatically due to a serious error condition
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause psecure-violation

7. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
A three-fold combination of 0 - 1 and X (don't care)
Trunk
Down - static access - trunk or tunnel

8. Selects an interface-range macro and enters interface configuration mode
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
15 metres
Switch(config)#interface range macro {name}
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

9. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Process the first packet in a traffic flow to determine the destination
LC - MT-RJ or RJ-45
Cisco Express Forwarding
CEF punt

10. Displays the contents of the CAM table
SVI or native routed interface
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#mac address-table aging-time {seconds}

11. What are GigaStack GBICs used for?
Switch(config)#errdisable detect cause rootguard
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Manually by administratively disabling and re-enabling the port
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

12. Enables error-disable for conditions that trigger unicast flood blocking on a port
Static access or dynamic
Switch#show ip cef
Switch(config)#errdisable detect cause unicast-flood
FIB with adjacency table

13. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
300 seconds
SC or MT-RJ
S = Short; L = Long; E = Extra-long

14. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
The adjacency table
Switch#show cef drop

15. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
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

16. What is the maximum cabling distance for 1000BASE-LX/LH?
The CEF epoch number
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
A name assigned to a ranges of interfaces
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

17. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 km
Configure the appropriate values manually on both ends of the link

18. Displays error-disabled detection status
Switch#show errdisable detect
CEF glean
LC - MT-RJ or RJ-45
IEEE 802.3

19. What is 100BASE-T2?
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
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
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
A switch port that has been shut down automatically due to a serious error condition

20. Enables error-disable detection
S = Short; L = Long; E = Extra-long
The adjacency table
Switch(config)#errdisable detect cause {all | {cause-name}}
Routing table and ARP table

21. What is the content of TCAM Mask entries?

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22. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
10 km
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
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

23. What is the administrative mode of a switch port that is a member of one VLAN?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Cabling specifications for Gigabit Ethernet
Static access or dynamic
The Layer 3 engine

24. Displays CEF Drop statistics with number of packets and reason for each line card
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-if)#switchport mode access
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch#show cef drop

25. What is an interface-range macro?
A name assigned to a ranges of interfaces
Switch(config-if)#switchport mode access
Manually by administratively disabling and re-enabling the port
Store-and-forward

26. What information is stored in TCAM?
ANSI X3T11 FibreChannel
Static access
Routing table and ARP table
Security and QoS ACLs

27. What are the common PMD types for 10 Gigabit Ethernet?
Switch#show ip cef
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

28. What is LAN PHY used for?
Interconnecting switches in a campus network
Static access
UTP Fast Ethernet and Gigabit Ethernet
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

29. What is the maximum cabling distance for 10GBASE-LR/LW?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 km
Switch(config)#errdisable detect cause ilpower
ANSI X3T11 FibreChannel

30. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show ip cef {interface} [detail]
Full duplex

31. Enables error-disable when an interface has been looped back
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 loopback
When one station transmits at the same time as another on a shared medium
IEEE 802.3z

32. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Switch(config)#errdisable detect cause unicast-flood
Creating the VLAN
Configure the appropriate values manually on both ends of the link
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

33. How are the TCAM Mask/Value pairs evaluated?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Tunnel
In parallel revealing the best (longest) match in a single table lookup
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

34. What is the name of the CEF engine that maintains routing information in software?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Ternary Content-Addressable Memory
The Layer 3 engine
Switch(config)#errdisable detect cause udld

35. What is FIB?
A name assigned to a ranges of interfaces
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
American National Standards Institute
Forwarding Information Base

36. What is the standard for 10 Gigabit Ethernet (10GbE)?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show ip cef {interface} [detail]
Switch#show adjacency [{interface}] [summary | detail]
IEEE 802.3ae

37. What is the standard for 1000BASE-T?
CEF punt
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
IEEE 802.3ab
Switch#show errdisable detect

38. What CEF optimisation technique cache FIB entries in switch line cards?
Accelerated CEF (aCEF)
Switch(config-if)#duplex {auto | full | half}
Switch(config-if)#shutdown
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

39. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
XENPAK - X2 - or SFP+

40. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Trunk or dynamic
Switch(config-if)#shutdown
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

41. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
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#show errdisable recovery
Trunk
Switch(config)#errdisable detect cause vmps

42. What are the common cabling specifications for Gigabit Ethernet?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config-if)#switchport access vlan {vlan}
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

43. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show adjacency [{interface}] [summary | detail]
S = Short; L = Long; E = Extra-long

44. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config)#errdisable detect cause storm-control
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-if)#no switchport
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

45. What is the maximum cabling distance for 1000BASE-CX?
25 metres
10 km
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#mac address-table aging-time {seconds}

46. What is the DTP negotiation mode of a switch port configured as trunk?
On
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable detect cause l2ptguard
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

47. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Trunk
Switch(config)#mac address-table aging-time {seconds}
A switch port that has been shut down automatically due to a serious error condition
From 30 seconds to 86 -400 seconds (24 hours)

48. What is the role of a Switch Engine (SE) in first generation MLS?
Cisco Express Forwarding
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 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
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

49. Displays interface configuration information
Switch#show running-config interface {interface}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

50. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Switch(config)#errdisable detect cause bpduguard
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
Static access
The adjacency table